4.250 crank factory 340 block

Marcohotrod said
why go 4.25" ? too much extra friction after the exhaust valves open, revs like a pig. when car craft built 6 similar engines, the 440,460,454, and the 3 455's, the 440 had the most torque and tied for most horsepower with the shortest stroke and least cubes.

I'm no expert but my 442 was quite snappy as far as throttle response and was an absolute blast to drive. It is a torque monster. 1500 rpm in 2nd gear, mat it and it blows the tires off.
10.79 @ 123 the first time to the track with minimal tuning. I was very happy. I'm sure there's more in it.