You said stock. Modified I'd go with the 3310 Holley 750!
I've run 3310s on mild 360s, it'll work great on a 383, even a stock 383. There are quit a few that had issues with the street avanger, its been all over these boards, the 3310 is tried & true, the only other T&True is the 600 1850, be he will be much happier with the 750 on that 383 IMO, but to each his own i guess.
75 Duster, 451 10.87 @ 123.58 NA
97 Z28 6sp., 12.01 @ 115 on a 100 shot
71 Swinger. 360 magnum. 12.58 @ 105
78 cutlass, 469 BBC. 12.70 @ 108 on street tires.
http://www.youtube.com/watch?v=Z2kqNmMfheU
