A 360, j head with an xe268H in a Demon can run 12.50's or better in the right hands.
Takes work to fine tune the combo and with an auto, the converter is key.
Truth. I had a 360, mildly worked J head, XE268, LD340, 750 vac sec.
Ran 12.75 in a daily driven Dart with a stock ~2200rpm stall and 3.23's. Ran 12.75 @ 107 in good air. Car sat for 8 years, went through it and ran 12.9 @ 105 in the heat of the summer.
Same sluggish 1.9 60'
First time out playing with spray, on a nasty day went from 13.3 @ 104 to a 12.18 @ 116 on a 47 jet, not hitting it til 100' out.
I've come to the disappointing conclusion I probably can't hit the 12's with a 3.23 gear.
Car feels good but I think its at about the 13.30's.
3.91 gears are ready to go in...that should do it
but I'm on the fence since a newer design looser convertor may work better...maybe something in the 4500 range...
You can get there, just takes a well matched combo. I went through the gear/converter debate many times. I prefer the street manners of the stock converter and 3.23's.
