509, Torquer 383 intake, 3310 holly, 383 with stock 67 heads, Manley pop up .30 pistons, 68 street hemi converter, 4.88 gears in a 70 all steel Duster. 11.67@117 mph. Idled nice at 600 rpm (after carb work) all back in 1979. Tried 750-850 dprs, never made any difference. It had the M/T valve covers and stock dist (one tiny spring) with a MSD 6 and the yellow Accel coil and wires. Hooker fender well headers with 12" extensions. A little 2 gal Moom tank and a Carter electric pump, 3/8 aluminum line. I might have had $500 in the whole car. Forgot to add, snorkel scoop on the steel hood. Makes me wish I had it back.
get the 509 and don't go overboard with the carb, no Russel fittings, no braided line, no wire looms, fiberglass fan, Moroso air cleaner, no shiny stuff.