back in the day i had a '68 383 4spd road runner with 4.10 gears. with a dp4b intake, crower 201hj cam (228@.050-.480 lift, no longer available), hooker 1 3/4 headers, 780 holley, probably 3850lbs with me in it, stock pistons and heads; it would tickle 12.90's. drove it everyday, it was the only car i had. with today's modern heads and cam profiles this should be easy to duplicate. just one biggie to keep in mind, DON'T OVERCAM! evrytime i went to more cam the car slowed down.