Plug gap I would run around .030-.035. 14:5 comp I would run at least 112 octane possibly 116. I run Alky (meth) in mine. I'm 15:1. Can't remember plug # off hand, I run my timing at 34 total, (I have old A429s) but with your A460s I would try around 28-30 total. Don't need much timing with those heads. John.