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The 4/71 is a little small for your engine. A 6/71 would be more suitable.
Can you list your cam specs and compression ratio please?
Are your carbs just Holley 1850s, 600 vac sec?
I hope I was of some assistance to you.
Personally I would run a pair Edelbrock or Carter AFBs.
Way easier to tune than inline Holley 600s.