Did I waste a bunch of money?

Well after driving my recently "top-end rebuilt" 318 for a couple hundred miles it seems like the rings might be going. It's burning oil (especially when hot) quite a bit so it could be the intake (couldn't figure out how to get to those center bolts to torque them properly) but I can't be sure. Compression last time I checked was around 100-105 psi for all cylinders which is a bit low too. Anyway, would I be able to transfer the heads, cam, lifters, and valvetrain (and of course manifolds) to another 318 short-block in better condition some time in the future? Also how much do good 318 short-blocks usually go for?
Author: admin