440 source heads on a stock 440

I have a stock 440 rotating assembly, stealth heads, comp 21-221-4 cam, eddy performer 440 intake, 750 vac sec Holley in my 76 W200 with a 727/203, 4.10 gears, and 36" tires. She gets up and goes pretty darn good. Still restricted with stock exhaust manifolds(need to get the shorty headers installed) Would love to see what it would do in my Demon.