Oh - I also picked up a cheap "mock-up" engine. I'll tear it down and just use the block and heads to mock everything up in my Chevy II. Depending on what it looks like on the inside, I may rebuilt it with a few upgrades as a motor for my '72 Suburban at some point. I'm not sure what the issue was/is - it was in the core pile at the local salvage yard. It's a run of the mill 5.3 (LM7).