"...burger-up a perfectly sound..."
no no no. That's how it wrks. Even if 'done @ home". The main concern - how to keep shavings out of the combustion chamber. There R a few intakes to do this right there in GB.
I recognize ur name, AL, but forget ur rig. A typically low hood '60s stang (the most exported usa 'classic')? So it might help w/that too?
Take the end plugs offa da log, stuff it w/rags? Machine away right there on motor (9 inch or 4.5 inch 'grinder'). Drill in 2 bolt holes, tap them. Pull out rags, vacuum inside, use magnet, blow air, etc. Get studs to match, mount & leave choke on center carb only. Tune...?