The AR52 are pretty cold for a street car on pump gas If I was going to use the 13/16 size spark plug bodys I would probally use the Autolite 53 or 54, or the resistor plugs in the same heat range( I can't remember those numbers right now )
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
If I was going to use the 13/16 size spark plug bodys I would probally use the Autolite 53 or 54, or the resistor plugs in the same heat range( I can't remember those numbers right now 
)