[blykins]

Yes, same camshaft.

The heads (at 200 cfm) would be head and shoulders over the E7 heads. A basic rule of thumb is that you can get about 2hp/cfm if the rest of the engine combination is "right". So with a 200cfm intake flow, you could see around 400hp if the compression and camshaft were right.

Those heads would of course work with 393ci. However, I don't think you'd see much of a horsepower increase over the 351 cubes. You would see a lot of difference in torque, which is what you feel.

Never pass up cubes if the price is right. It would give you a better foundation for future improvements later on.

The 3.85" stroke is nice because you can still use a factory 351W rod and you can use a 302 piston.

If you go with the 393, the camshaft would need to be bumped up to deal with the extra volume.