I saw in a search that some have used gen II plugs. Can I do this with an '80 and which would be the best choice?

 

Yes, you can. I've been using the NGK's BUR7EQP for Leading and BUR9EQP for trailings the P stands for Platinum.....

My car performs much better with them and they last much lunger than stock plugs.. I got mines from http://ww.racingbeat.com under rotary, second gen, iginition..... stock plugs.....

Hope this helps...

http://www.rotaryrx7.com