Thank you, I am running the RC12yc in it for the break in period, fouled after about 200 miles and cruising primarily at 2-3k RPM, weather is cool now in Northeast so hot plug may work, I am also running an MSD 6A Ignition.
I will change out plugs back out idle screws 1.5 turns listen close and...
Thank you novice here well it’s been awhile My 1970 Barracuda just came out of a 33 yr storage, we refreshed included rebuilding the original Holley750 , I have driven her about 200 miles not really opening her up but more crushing at 2-3000 rpm.
I will check ground good tip, This is a fresh Rebuilt too so I am thinking the jets may need adjustment. Pulled plug totally black not that wet but black
383 with Holley 4150 750 MSD ignition, running her on the street in break in stage getting plugs foul,, best plugs? and best way to lean the Holley out a bit Thanks