I had a 671 on a 350 years ago. Got the car in a trade & it had stock pistons and was forever burning them.

We found 9:1 was too high compression, so we took the blower off till we could build a decent bottom end with low comp forged pistons. That blower is on my current bucket with a properly build 540 cube big block under it. My compression ratio is around 7.6:1

Really, you need to build the engine to handle the blower, because one day, somewhere, you are going to stand on it. I dont buy the "its just for looks and a bit more power stuff" because we arent wired that way. You can trust me on that.

I do see that people seem to run around 9:1 compression on the vortex style blowers tho, so they may be an option too. Havent used one of them yet, but have one on an engine in a project Im slowly working on.