I built a HP950 from scratch about 20 years ago using a genuine Holley HP bare main body. When you bought one of those, bare meant “bare”.
For the end user, the only reason to try stuff like this is because you want to play with it. There are some pretty good deals out there for carbs these days.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads