Ran one in a 340 Dart years ago and I loved it. It was a stock 340 and internally the 280/474 cam and valve springs were the only change. Had an old Eddy dual plane intake and a 650 DP Holley carb. Also had headers and 2.5 exh system. It was a totally stock 904 auto that was behind a stock 318 and I just swapped it in when we took out the 4-speed. Oh and it had 4.10's with G60-15's. It ran great and had real good low end. It ran 13.49 @ 105 nursing it out of the hole as it would fry them street tires and this was back in 1980 so there was no drag radials to use back then. I feel very sure with the 105 mph it would run easy 12's with slicks and a good converter. And it idled just right with a bit of lobe to it. Ron