I hope it will be hot this spring when I put the Stealth heads on. It ran real strong with 516 iron heads but big time valve guide issues swayed me to get aluminum heads.
CR with 516 heads was about 9.7:1 with the Stealths (shaved a bit), CR should be right about 10.4:1 using .039" gaskets. Currently MP steel shim gaskets on it .020"
The 516s had a mild bowl blend and so will the Stealths

383 .060 over decked, balanced rotating assembly, flat tops
Crower 271HDP hydraulic - 222°/234° .486”/.496” LSA: 112° RPM: 1800 to 6000 Redline: 6500
Isky adjustable iron rockers
Edelbrock RPM intake
Holley 3310 750 vac secondary
Doug's Headers
MP electronic ignition

The car gets up and moves. Granted it's a 4 speed with 3.91 gears but a 70 rr is no lightweight car either. Will fry 275-60 tires pretty well. Hasn't been down the track yet so no ET info