The '66'69 engines had a blueprint deck height of 9.175 inches; later blocks are 9.208. This affects intake-manifold, pushrod, and piston interchange.

Induction: This is what gets all the looks when Joe pops the Javelin's hood. He managed to horse-trade a bunch of stuff with a guy who had an original STR-11 cross-ram intake manifold.

Stock Amc V-8 manifolds flow okay, but they tend to crack. Replacing them with long-tube headers will help power at all rpms, while shorty headers will see good gains but mostly at higher rpms.