I run a 408 also because it makes 52 more lbs. of torque than my previous 363 i was going thru the traps at over 7.000 I went to a 4.10 but I am only going thru at 5,700 I am changing to 4.30s pretty soon. My Dart runs 10.70s but I slow it down to run 11.50s with a setup pretty similar to Mr Ps. , I might add that my 60 fts. remained the same going from 4.88s to the 4.10s because of the torque. Heres a picture of my stop, I have been running it for 8 years now and it works well.