holley carb help

For street, the DP for sure. It's waaay more funner! You can open all 4 holes at what ever rpm it will take it without detonation.I slowed my advance curve a bit, off the bottom for that reason, with a 2-stage curve. I was able to go back to 3.55s, with no perceptible loss of bottom end as compared to a 750 VS and 3.91s. It lights up the 295's almost right off idle. Whoo-hoo! Yeah I'm a just a punk-kid in an old mans skin! lol
And the Smaller 650 is easier to modulate wheelspin with, which makes sliding around corners a bit more controllable.
My cam is a 230@050fast-rate and I use a 750DP. It has quite a bit more torque off-the-line, then when it had the Mopar 292adv/549. Second-gear Sliding is super-fun

For track work cant say.But the 650 is likely a bit small. Mine made more mph on the 750, but was hard to get off the line without wheelspin.Actually, with 325/50 DRs, it was impossible,on our track, to not light them up. Still went 93/8th.