I've replaced the governed Holley carburetors on several trucks (Chev 366, Ford 361) with the 650 vac. sec. carburetor..............
Before you begin tuning the carb. the engine needs to be running 100%........good/even compression, ignition system checked out, etc.............otherwise your best efforts will be in vain............
You'll likely need to re-jet the mains(possibly a different plate for the secondaries as well)..........Install the highest value power valve(10.5 "/Hg) available(providing the engine is in good shape 15"/Hg vacumm @ idle or greater)..............also ,the spring for the vacumm secondary diaphram may have to be changed to a heavier spring other wise the secondaries may never open under load.........adjustments to the accelerator pump may be needed as well.............
If you can find some Holley literature(cross reference books) you may be able to see what comparitive engine/carburetor combos of your vintage were using for jetting, power valve, etc. to give you a baseline...................
It would be a good idea to get a tuning guide for Holley carburetors, it will prove invaluable.......
There WILL be some trial and error involved but it can be done............
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