[wizardofx]

Carb sizing is always fun. So the CJ is running 4bbl heads right? I had a 750 Holley with a mild cam and it was too big for the Cleveland 4bbl. The Holley 650 dp was best. Personally I like spread-bores for street fighters. - Just my observations.

 

[wizardofx]

... Sorry I swapped my bores. I like square bores are great for street fighters.
Spreadbores are great for daily muscle drivers. They're much better on gas and can be tuned when you understand how they work. You'd also need a spacer plate.

 

[wizardofx]

Those 351 4bbl heads really like to breathe with those enormous ports and valves. What gears do you have in the rear? Are you running a stall converter if auto? Is the car for street only or or track too? These all play into it, but jetting will probably be your biggest factor.

I had a '71 Torino convertible with the 351 4bbl heads. Performer manifold, mild Isky cam, Holley 650dp, supertrapps, kitted C4 and 4.11 9" with 31 spline axles. It tended to flat spot a at part throttle, but when the rpms came up, it was a freaking rocket. I needed a 3500 stall converter.