Here's what my 68 Dart 360 was/
std bore, 10to 1 KB's
273 rods
508 purple shaft
stock 360 small valve heads
adj rockers
single plane intake
worked 750 dp holley
windage tray
hooker headers
stock torque convertor
rebuilt 904 with a shift kit, nothing else
3.91 suregrip
street tires
full flowmaster exhaust
Car ran 12.40's all day in 90 degree heat.

So don't let anyone tell you they won't run. Had I had the chance to put in a stall and the 4.30's I bought for it it would have gone 11's all day. It ran 1.94 60 foot times so it wasn't taking off very well but pull as hard as a big block on the big end.