You may need to tune/calibrate one of the new or boxed rebuilt stock spec carbs though...just adding a slightly larger cam, small bump in compression gave my '74 Formula 400 a lean bog from a dead start.
I lived with that for years because I didn't know how to fix it 20 years ago.
I currently have a Cliff carb on my 455, no bogs, stumbles or traction until 3rd
__________________
2 sons, 2 Firebirds. 1971 Formula 455, 1972/w 455 HO added.
1974 Formula 400 "retired", parts car now.
