[unruhjonny]

Originally Posted by Skidmark

Id probably be happy with 275 hp. Sounds doable on a budget.

The (b)hp numbers published for the 1971-1972 Pontiac 400 were 300hp
1971 = #96 heads, 067 cam, log manifold, standard intake, 750cfm Qjet; full dual exhaust (2-1/4" pipes)
1972 = #7K3 heads, 067 cam, log manifold, standard intake, 750cfm Qjet; full dual exhaust (2-1/4" pipes)
The net-hp numbers were about 50 less - but that's still a substantial bump from the 1975 rating of 185hp.

I need to ask;
Does your car have a factory style exhaust?
(factory was a 'Y' pipe after the engine, to a catalytic converter, and single to muffler behind the rear axle - and dual after muffler.)