Piston I D

What heads
CC your heads and get an accurate CR B 4 ordering cam
and get your rocker geometry correct B$ ordering pushrods IDK what you are using for rockers IF HFT ot Solid and stock or Iron rockers you are OK- if roller tips then you have some spacing to do

good point NM the machine shop should be put on notice
OP check with KB and Badger and see exactly where they should be measured

If you have Iron heads 9.5 should be ok with moderate cam 9.0 with short cam and 10:1 with a big cam
although there was a recent post of lots of compression with a short 25 cam- I have no idea how he did it
also depends on weight, gearing, converter, and usage
a truck with a camper and a boat on the back or motorhome pulling a long grade has to use lower CR than a Duster 4 speed with lower gears