Just getting ready for the Street Rod Nationals next weekend. Cranked up the truck to move it to the wash rack and the old 327 (stock original) sounds like it bit the dust, A bunch of rattling and metal sounds. Looked at the top sides and all looks OK oiling, no visible damage and tight.
No time to fix it now, I need to drop a new engine in.
Question: What all will fit? Given an option what's the best value and most buildable block.
Engine sets in a 1966 Chev C10 with a 700r4. I have a custom 3" stainless exhaust system bolted to a set of ceramic headers and do not think I have time to modify before the show. So I need a pretty good fit.

Thanks in advance