Heres mine. Factory 340 HP, 455ft lbs of torque with 10.5:1 comp!
Like I said above, I got mine for $350 on craigslist. I used
http://www.searchtempest.com/ to find it. Searches multiple craigs pages at once. Anyhow, they are out there, and parts arent that scarce. Speedway sells new pistons, rings, bearings, valves, and oil pump rebuild kits. They even have a whole aftermarket distributor as well. Autozone carries rings, timing chains, and other internals. Good luck with your search.
Here is a link for the trans adapter.
http://www.transmissionadapters.com/53-66_nailhead.htm