Circle track is a little different than my experience, but I once had a 400 block with a 3.295 stroke to make a 358. Although it ran really well for it size, I am sure the car would have been faster with a regular 3.75" stroke. The motor was 14.7:1 compression, had ported brodix 11x heads... It made 608 hp at 7900 RPM. In a 3200 lb car, it ran a 7.15 in the 1/8th and a 6.29 on a 100 shot. Also, with a 406, the RPM range would have been lower which is easier on parts.
Adam