Yeah, it seams that unless you own a camaro or a corvette, research on the internet is quite slim. I have been looking and asking everywhere and have found bits and pieces.

HN coded engine:

65 corvette 327, 375 hp, manual trans, efi, ti
68 impala 327, 250 hp, 4bbl, powerglide, reg gas
69 327, TH350, 2/4 bbl
69 350, turbo hydromatic, 300 hp, 4 bbl

Thanks for all the help!!!!