@joules posted:Consider a professional / custom rebuild on the carb or a new carb. Bob at Competition Carburetion will build and jet a carburetor based on your personal engine specs and it will work straight out the box!
Ditto on Bob Oliver
I sent him a new in the box 670 avenger with all of my 404-C stroker engine and car specifications. Blue printed everything and final flow of 710.
when setting up for FWHP dyno, my tuner saw the Holley and complained that he did not like them because they never seem to be responsive to his tuning attempts.
after several runs and several jet changes he admittedly ate his words, at least on my Bob Oliver Holley. 😉
Larry
and if you have to ask how much it costs (I really don’t remember), please just look at it as a very small expense when building a new engine, and also a very small expense to maximize performance on an existing or newly installed manifold/carb upgrade.
Larry