Spitfire vs. Block Huggers for SBM in an early A

for that set up you're not going to see massive gains between a shorty header and a 340 manifold. and honestly, a 360 or magnum manifold might be damn close as well.

here's a thread from last month on the topic: Shorty Headers

basically, it comes down to if you're going for headers, buy the expensive ones or suffer the consequences of fighting with the install. even more so with 4spd application.