My old DartSport now owned by 73DartSport, pump gas 451" low deck(just a 440 crank in a 400 block), half filled, 590 purpleshaft MP cam, CNC ported Eddy heads, 2" headers, M1 tunnel ram, 2 750 Quickfuel carbs, 1.6 Harland Sharp rockers, 6.20's and 9.80's at 3050 total pounds with driver. Most fun and reliable(and streetable) combo I've ever ran.

Edit: I mentioned half fill in the block but I may be wrong, I dont think this 451 had any block filler. The purple 69 Dart had a 500" low deck that was half filled. Aluminum main caps on both motors.