The Summit brand carbs are actually an old Holley design from the early 90's that never caught on. They were trying to build a next generation carb, but everyone still wanted the old modular Holley. As such, I don't know if they are good or bad. I have one (650 DP spreadbore), but have never tried to use it. It was almost new when I got it as a freebie with a wheelbarrow of Holley carbs a neighbor gave me instead of throwing them out. Even with about 4 or 5 Holleysand 3 Edelbrocks at my disposal, I still hunted down a Quadrajet for my Cutlass. It is a decision I do not regret as the part throttle and fuel economy are second only to EFI. Plus, it bolted right in place with no modifications. For an intake, I run an Edelbrock Performer I pulled off a Camaro in the junkyard for $15. The fuel pump is a Holley that I painted black ( it was chrome and I despise chrome under the hood), which was also a freebie. All tolled, I have less than $100 in my entire fuel system.