13's, stock '71 318 short block.

I think I've got a couple of .484 Purple Shafts floating around here someplace if you're interested. I have one in an 8:1 360 in a 3300# wagon and it goes mid/low 13's all day. Stock J heads and an Offy dual plane 360 intake, 1 5/8's headers, mufflers, pump gas, Holley DP. Been in the car for over a decade. Fish is right: that LD4B is a kick butt low compression intake.