What's the most power you could get out of a set of stock magnum manifolds? I'm taking my car back to more of a cruiser and ditching the turbo and going with a straight drive and I really don't want the hassle of low hanging, ill fitting, and expensive headers. I plan on assembling my 360 alittle differently then planned for the turbo but I'd still like to make a solid 350hp through the manis.

Crank or rear wheel HP? Crank is easy. Stock magnum, cam, intake manifold. Done

My stock 5.9 with a cam change, 2bbl M1, mid length headers, and a computer tune made 285 HP at the wheels. Should be 350-370 crank HP.

Different cam to move torque higher to the RPM band should make more HP. With massive amounts of wheelspin off the line, I can stand to lose low end torque to chase HP in the upper RPMs

I'd like to make 350 at the crank. I've got a selection of parts already. I have a set of flattop hyper pistons that should be close to 9.5-1 with the heads I have, a set of 1.88 valve heads that have been milled to have 67cc chambers, a .480 lift mystery cam (sold my boost cam I just bought), and a victor 340 single plane intake. I really wanted to run stock magnum exhaust manifolds just for the fit and I know they have to flow better than LA offerings. I just don't want to fight headers on an A body anymore lol I'll also be running a 4spd with 3.55 gears.