Just converted to HEI in my 350 and was wondering what plug to use and at what gap? Would like to stay with A/C Delco. I am a purist when it comes to that.

I have had A LOT of luck with the Rapid Fire's(AC Delco) Infact they are all I run, since I tried them in my first '68, and with an HEI gap them at 45, Give the plugs a shot, you'll be glad you did.
Jim(The Big Block '68 Chevelle Guy)