Its very easy to make a Pontiac fly if you build them correct. They have very small port area and a long stroke. So you build them around torque not RPMs. One of my daily drivers is this 70 T/A its 440 inches. I had to sleeve all Eight holes because someone let the block rust. So I under bored it, I didn't want to break into water or weaken the deck. Then I added some stroke. its 9.6 compression D Dish .040 piston to head clearance, The key on these motors are they Love Wide lobe centers.
Cam 230/238 114. at 38' timing it runs amazing on our California watered down 91 gas. Ported #12 Heads stock plenum worked cast iron intake, Cliffs QJet Carb, Ram Air products Exhaust manifolds with a Pypes transverse ex. system. With a 3.23 posi, stock converter T 400. This car gets a average of 17MPG and will blow the tires off. This car is super fun and now right flys.
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Ken Maisano