The pump gas 6 pack stroker motor going into a 1970 Supperbird will have iron 906 heads with between 9.0 up to maybe 9.7 to 1 comp ratio, 4.25 stroke with 4.350 bore.
The other pump gas motor will be a stock stroke 440 bored to 4.360 to straighten the bores up, it will have around 10.5 to 1 comp. ratio depending on what the deck height is, with a set of Eddy RPM heads. It is going into a 1970 Challenger 4 speed car.
I haven't decided on which cams to use yet, probably a Howard 723515-12 grind in the automatic car and a tiny bit bigger hydraulic roller cam in the 4 speed car, either a Comp Cams grind # 23-710-9 or the Howards cam grind # 728005.09 grind