Robert is right, sub frame connectors at the very least but I have not seen any available for a Pinto. I had 2 choices and one was to tie in to the front leaf spring mount and run the tubing through the floor to the front sub frame OR tie the front sub frame by welding in a kicker front the front subframe to the rocker and attach the front of the cage to that bridge and a bar straight back along the rocker to the main hoop which I mounted directly over the front leaf spring mounts. The rear bars off the hoop go back to the rear leaf spring mounts so it is all tied together. The top bars coming off the main hoop foreward stay up close to the roof and curve down in front of the dash between the vents and the doors. Then the bar that crosses over head is just behind the visors soI can still use the visors and put them in the up position when not needed yet pull them down when needed for street driving or when the sun is in my eyes at the track. I tried to make the cage user friendly and to not stray away from the street car theme. I still have the rear seat intact and my kids ride in the back fairly often when cruising or just going out for a drive. My bar that ties the sub frames is about 1" off the floor and about 1" away from the rocker panels. The chassis is very stiff with the 8pt cage and it is a custom bend to fit cage, not a prebent cage from a catalog place.
The suspension on mine is still totally stock. My wagon came with a 2.8 V6 and A/C so it has the same front springs as a V8 Mustang II and the rear springs are the same as a V8 Mustang II I believe. It is the stock spring pack and wagons came with staggered shocks meaning one shock is in front of the rear end and the other side is in back of the rear just like the old SCJ Drag Pack Cyclones, Torinos, Falcons, and Mustangs which eliminates wheel hop without using any traction devices. The clamps I am using are simple store bought thich steel plates that go under the leaf springs and a U-bolt goes over the springs and when you run the nuts on with the u-bolt going through the plate it forms a tight clamp that hold the leaf springs tightly together so they don't slide or slip effectively making the leaf spring "solid" in that area. Putting multiple clamps between the rear housing and the front spring eye greatly stiffens the springs and prvents them from wrapping up when a lotof power is applied at once. The right rear springpack on mine also has clamps otherwise my right rear sits down over the slick and the left rear of the body extends away from the slick and it launches with the left front sky high. I have tried to keep that from happening but after nearly 15 years of hard launches it no longer is able to launch without the front coming up high. The suspension is totally worn out as is the front coils and rear leafs. I am hoping the Cal Tracs allow enough tuning to keep the front down and get 60' times in the 1.20s using a 10" wide slick. My wagon is very heavy so the springs I need are stiffer than what you need. When I first started racing it with no front/rear bumpers and no hood with no cage and all iron 351W it weighed 2860lbs without driver. Since then I have added a 9" rear, full cage, '71 front/rear bumpers and front/rear valance panels, various safety related things, large headers and full exhaust, extra complete Pinto insulation added to my stock carpet and original insulation to keep the noise level down and the heat out of the driver compartment, heater box, and 2 seperate fuel systems (one for nitrous system when it come time to use one again), and other little odds and ends. Now it weighs a tick under 3200lbs without driver and 5 gallons fuel. An overweight pig for sure
It seems the more power I put to the chassis the better the car works. There is literally thousands of passes I put on this car over the years and many different engine/trans combos(all 351W/C4 combos). I am seriously considering goin down to 28-9-15 slicks if the Cal Tracs work out well.