Planned on drilling out the baseplate bores/pressing in a bushing/ream bushing ID to fit shaft. Sound good? What would you suggest I use/any tips/anything I am missing. Thank you for your time.

I used bronze guide liners to do a tquad,once.Ream,press in,them broach to size.Some auto machine shops use them,they could help.

Can I buy guide liners commercially esp as I have some valve guides to do also. Mc Masters or goodson or??

Being the cheapskate I am, I just used brass tubing from the local hobby shop. I forget the size, but, I took a bare shaft with me to find the size. Mine was worn enough that I didn't need to drill the base plate. I cut the tubing a little long, and carefully tapped it in with a small hammer and a piece of wood. I cleaned up the (inside) edge with a small rat tail file. Once the 'bushing' was in, I set the base plate on its side and put a few drops of loctite red around the bushing.

Its held up just fine in a real everyday driver situation and did away with that annoying whistle.

I'll prob freeze the bushing/slightly heat the baseplate. I'm worrying if the shaft will b worn unevenly & need attention

RR ... how badly are they worn ?

Not sure bro but I want to do em (dual AFB's going on a 451) to b proactive & I want to spend some money plus they're 40 + years old

I have never REbushed a base plate ever. Never ran into a carb that I was going to do or use that needed it...... B U T ... I have heard of some that were soooo bad that they caused severe vacuum leaks ...and actually were ...

Your point about getting them in STRAIGHT and TRUE should be a concern. I would say take them to a small machine shop locally.

Yes, goodson sells them and the related tooling.As a side note,If the rebuild is basically stock you can get + .o15 valves.Larger on the stems and the valve diameter.

Reaming the baseplate oversize for bushings requires a reamer with a pilot that's long enough to extend all the way through the baseplate before the flutes make contact. This is the only way to prevent crooked throttle shaft bores.

Thank you John & a guy has the right stuff & wants 25 a carb so I might just let him go ahead

I use a home made version of the method sold here Throttle Shaft Repair Tools

Works great!

BTW I HIGHLY reccomend a good cutting lube when cutting the aluminum, you don't want it the cutter gall or bind up mid way or it can get ugly in a hurry!

I have 2 identical 4131S AFB's & for sure dont want to mess one up