Originally Posted By markz528
Some 383 pistons will give you extremely low compression especially on a 906 head.


Agreed. You can overcome some of this with a cam that has a more aggressive lift rate. I think there are better options out there than that Performer RPM cam if you're using some ~8:1 Speed Pro flat tops.

The Comp XE268 will work with power brakes and a stock converter. It will also preserve some of the low end you'll be giving up with the loss in compression.

1968 Plymouth Fury III
2dr FT, 383-4v, 4 speed

1972 AMC Ambassador SST wagon
360-4v, automatic

2014 Challenger R/T Classic 6-speed