I did find this info. on the web about another HN application: HN 1968 327 250hp 4 carb. Pwrglide, reg gas. (Not sure how reliable that is?!?) It is a 327 and has powerglide. I had been following that lead, but now you have me wondering...
I'm going to check on casting date and number. (I just finally figured out where it is from CRG info.) The car is stored right now about 60 miles from where I live, so that will take me several days. (Gotta work to pay for these things.)
I'm beginning to think this is a real "piecemeal" job, but everything works well, and like Rich said, it is a good driver motor.
I really appreciate the help!