aftermarket Carb vs. DIY build 750-850cfm

[Project86]

are there any cost benefits to purchasing a ready to run carb versus building your own?

looking for a 750 dp with no choke, mechanical secondaries down leg boosters

would it be easier to purchase a 3310 style carb for cheap online, replace the main body with something like a proform or equivalent?

what style holley carb should I be looking at?

carb will be on top of a 11.4:1 aluminum headed 383 stroker with a brodix HV1800 intake. custom grind cam. forged internals.