Not many z guys left in my area and I don't have my dad to ask anymore

I have his old 74 260z I got my hands on a 82 block from his collection and I have several e31 heads ,n42 heads e 88 heads but I really want to build something cool I know you can put 280 valves in e31's with some machine shop help but can the motor run with the e31 head on it on pump gas as the flat top pistons etc, I have heard talk about the compression going to high for pump fuel but is there a way this can be done please let me know

also if someone knows were I can get a 3 piece rear duck tail fiberglass spoiler please let me know I had one on my 76 280z but can't remember were I got it from anymore

Feeling lazy and don't want to type it out again: http://forums.hybridz.org/index.php/topic/103174-e31-head-on-l28-block/

thanks for the help