67 twin turbo dart

That’s your plan? That thing is only running on 4 cylinders and they’re pig fat. I’d be doing a lot more diagnostics before I pulled an engine. Did you check injector wiring? Verify all 8 injectors are firing? Verify firing order and spark at all 8 coils? Cover the bases before starting over. Even if the rings are shot, (your compression and leak down numbers say they’re fine) you should be able to get a few pulls in and make decent power on the dyno without hurting anything. Get it running on all 8 before you go pulling the engine. That oil could be sucking in from anywhere if those cylinders aren’t firing. Are you’re dyno guys even remotely competent in the basics here?