[johnta1]

The A bodies can run better because the rules allow 'hop stop' bars for them.
The leaf spring cars aren't allowed any mods except straps on springs basically.
(the 67 Firebird would work better with their radius rods)

Lots of straps on springs and possibly add the upper hole on front of spring mount, could help the launch.

The 3 speed would require the 1st shift to be the problem for it.
Getting through the 'H' part at the critical 1st shift may slow the shift and the car's acceleration.

I would probably use the TH400 with the shift kit and smallest and highest stall allowed.
Mod the governor to shift at 5500 RPM (or whatever wanted) and leave it in drive.
(with kickdown still hooked up)

This is basically a bracket race where consistency wins.

I would also use the 068 cam setup.
Not sure it said anything about 1.65 rockers?
(they probably wouldn't know the difference?)

With the right tires, moderate launch, let the Pontiac eat!