I used a 395 (destroked 400, bored .040 over) in my dirt modified. It was a great combination. Not too much torque to break tires loose off the corner, but awesome acceleration down the straight. I was pulling mine 7800+ all day. Of course I used a Dart block, lgt wgt crank, billet ultra lgt rods, shaft rockers, etc. This things has a ton of power and explodes like a rocket once your off the corner. Good luck to ya, and if you need another motor, I'm selling mine...lol.