318 vs. 360?
I had a 318 in my 66 cuda for 10 years, also... it ran a best of 14.7 with 340 heads on it and 3.23's. - It would not do a burnout!!?!?
I swapped a 360 in it. Mild rebuild, but with a tunnelram. no other changes to the car, and I ran a 12.80 with burnouts galore... DEFINATELY happy with the swap!