Boost valve .460 I knocked the pin out of the primer valve and tapped the pump but left the spring so it does still function, drilled the pipe plug center with a 3/16. I drilled the stator support at the direct bushing lube holes. Opened the thrust washer lube hole to .110, drilled the converter fill hole to 1/4".I didn't do anything to the cooler bypass. Where do you mean drilling the high apply passage?
I did get a a copy of the Transgo Powerglide kit instructions and drilled the high feed holes to 3/16" in the spacer plate.
https://res.cloudinary.com/transgo/wbiss/rk/PG2S.pdf