Originally Posted by
MILD THUNDER
You might have the newer style heads on that motor, and they arent as bad as the old peanut ports. You can do a cam upgrade, roller rockers, and get yourself some takeoff used 496 aluminum exhaust manifolds(cheap and flow well). I think you can buy a adjustable fuel pressure regulator. You can make 375-400HP with these, but thats about it using the stock induction and fuel system. I know a guy who has installed a 454 mag cam in his 7.4 mpi, and gained 300 rpm and 3-4mph. I'd think with the cam, exhaust, and roller rockers 4-5 mph should be within reach. You''ll need to upgrade your valve springs as well. All in all, you can prob do this for under 1k bucks if you do your own work.