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yeah definitely intend on getting a few of needed size, I wasn’t looking to get a set with 30/30 sizes but I know they make kits of 5 or 6 up to 1/2” that is just good to have for other applications as well

I admire your preperation. This type of job is the type that I hated, and I do mean hated to do the most.

Before starting, I would get more drill bits of the needed size. They, as you know can break. I would also double up on the taps just incase something happens to one. But probably not an entire kit.

As to what @EBEBRATT-Ed says above, you don't really need a entire set. A good grinding wheel and a center punch is good to have too.

I hope the bolts come out without needing all of this. The only one that didn't give me much trouble was a Utica boiler. I think it was a star fire three or something like that name. It had stainless steel bolts and came out the easiest.

And some never seize on the bolts when your done.

Last one I bought was Vermont American...not sure they are still in business. Mad Dog

I mean there is no real sense to buy a complete tap and die set.

Most likely the bolts are 3/8"-16 national coarse thread which would use a 5/16 drill bit. You should get a starting tap and a bottoming tap and a tap wrench.

If they are 1/2" dia bolts (doubtful) you would need a 27/64 drill bit and the tap would be 1/2"-13 thread

7/16 dia bolts are a possibility you don't see them very much but 7/16-14 national coarse you need a letter U drill.

If you want real good taps Starett is probably 1 of the best. Craftsman and Hanson are decent brands and there are others. McMaster Carr would have tap sets and there is always Harbor Freight for cheap stuff

Depending on the work you do I usually never bought a tap set. Nice to have but too many sizes you never use.

I just bought taps and drills that I needed.