Horse power drop using early A 273 manifolds

273 said
I wouldn’t worry about running the 273 manifolds, it’s only an issue once you start adding a lot of cam overlap then you need long tube headers for scavenging. Difference in manifold hp not worth the worry.

really , at that level you are talking maybe 3 0r 4 hp nothing you would feel , at least he has a decent exhaust system not thefactory y pipe