Dyno'ed My 360..it's a pig..what next?

I guessed you'd make 285 at the crank before looking at the graph. A 750 is probably too big, 1 7/8 headers are totally unnecessary. You need a bunch more compression, worked over or new heads, and a bigger cam to get anywhere. I bet with some carb tuning you could get a lot closer to 200 at the wheels. Not all dynos read the same. You could jump on someone else's rollers and read something way different.