Cylinder Head decision

I've got a decision to make and I thought I'd run it by the great people on this forum. Apologies for the poor grammar and spelling I'm on my phone pretending that I'm working. Never buy a PANTECHphone !

I've got a miss in my valve train (1973 318) and it seems that there'sgoing to be valve work of some kind in my future. i thought that while I'm at it I should try to raise the compression. iI bought a set of 920 heads on a whim while I was on a work trip. Unfortunately since I was at work I didn't have the time or tools to take them apart i just had to assume that they were crappy . Upon further inspection, there'saat least two bad seats and some valves that are pitted and mild rust from sitting. My question is to you think it's worth having my local machine shop make these nice again or should I just find another set. I found a company called CME engines that offers rebuilt 302 heads fully asembeled for about 400 before shipping. However, I haven't found a lot of feedback about them . The engine is old and tired, I mostly want something i can tool around. thanks