Suspension recommendations needed
Note - to be track legal with that convertible, you'll have to have an 8 point bar if you're faster than 8.25 (13.49 1/4) because the Fairlane is a unibody car and your main hoop will be welded to floor plates. If it was a full frame car with the main hoop welded to the frame, you could get by with the 6 point. This is both an NHRA and IHRA stipulation.
I suggest you pitch the air shocks and look at a set of Rancho 9000 that would be used with Caltracks. The Caltracks would be the best suspension for the car, but for a couple dozen passes the slappers will do. If the air shocks are required to keep the body off the tires, you need to weigh the back end and then talk to a spring supplier to get some real springs. Calvert Racing sells some good (not cheap) springs.
1967 Falcon 4 door 351C - 70 Mustang 351C
Owner built, owner abused.