possible tuning issue, over carb'd maybe?

[Mattys1970C-10]

so ive been posting about this truck I got, its a 1970 c-10 long bed. 350 with rv cam, edelbrock intake and carb spacer, and edelbrock 650 carb. msd ignition, long tubes, duals to flowmasters dumped at the axle, stock heads. this thing runs like a raped ape, but off idle is pretty bad. if I hammer the gas from a dead stop, it barely squeals the tires and has a real delayed bog, and then comes on once it recovers from said bog. im no expert but this thing outa rip the tires off the rim from a dead stop, it has the power, its just not tuned or something. any thoughts? maybe a 650 carb is too much with stock heads??