I thought a rebuilt sbc goes by the 10psi per 1000rpm rule.
I can't tear it down either, Im living in a rental house in a community that hates my car. No joke they yell at me for it being too loud and "unsightly". I'm 100% sure they wont be happy if I rip the engine out in my driveway. I'm going to exhaust all my options before I do anything like that. I'll try the heavier oil and new filter first and see how it goes. 10w40 will be enough?
Hopefully that will get it up to an acceptable pressure. If not then Im not sure what I'll do with it. I've been wanting to drop an ls in there for a while now.