No point, your range is waaay out of spec, it's spanner time, let the dog see the rabbit...

The ONLY check to make first is pop the rocker cover and make sure all the tappets have some clearance.

Assuming 15 psi is atmospheric, 300 psi is theoretical 20:1 CR, and 345 psi is theoretical 23:1

So #1 and #3 are buggered and #4 is borderline.

It's spanner time.