I'm not an expert but i've rebuilt that exact carb (7041264?) a few times.
Get Cliff's book, give him a call, tell him your combo.
He will send you a turn key, ethanol resistant, kit for your engine.
Your shafts are probably leaky by now. He has a kit & tool for that too.
It's pretty simple to replace the parts.
The holley is "one size fits all"; the Quadrajet was built & calibrated for your engine.
Also there's the choke... I like the "divorced" choke on the '71 quadrajet. mine works GREAT. You'll need to install a manual choke w/ the Holley.
Not a big deal tho.
I think i have an aluminum spread bore adapter around here somewhere...
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