I'm needing some input from some head experts.

I have a set of cnc345 440-1 that are going on a 605. With 1.6 rockers my lift will be .800. So I need to install 2.100 springs to have enough clearance. I've bought Manley +.100 retainers and +.050 keepers. With .062 spring cups my install is 1.980! So I'm looking at the spring seats, and there seems to be plenty of meat there. Indy sez cutting .050 is no problem. My question is...How much meat is really there? Has anyone cut them .100? I see no way to measure the thickness. All input is appreciated!

Thanks...RIP