OP, remytherat, enough bench racing.
Here's a FREE, (postage $20) Complete, 80457-2, electric choke 600 CFM Holley, vacuum secondary.
Has factory jetting (64 primary jets), and is all original and unmolested.
In terms of a small CFM carb designed for stock or slightly modified small engines, this is it.
Plenty of tuning parts out there, jets, power valves, spring kit for the vacuum secondary diaphragm to dial in the secondaries opening rate, etc.
You should be able to find an LA style dual plane, used intake, for between $100-$150 here or less at swap meets
The carb will clean up nicely. there are plenty of resources for you to consult when you rebuild the carb.
Start with YouTube. Easily rebuilt with half a dozen basic hand tools.
Amazon has A Holley brand rebuild kit for $25.
So... For about $150-$200, (carb, intake, gaskets, air cleaner) plus some sweat, you'll have a nice power adder on your engine.
Oh, did I mention that the carb is 100% complete ?
PM me for address exchange.
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