Ragtop,
I just saw that 440 source crank with the 3.9" stroke yesterday and thought the same thing, no machine work. But if you read all his info it says they leave the crank counterweights large, I am guessing standard 440 size so you will still have to get the counterweights turned down some to fit that crank in the 383. But maybe just wait a few more months and he will have them all worked out as it seems his inventory is growing pretty quick. Anyway still a really good deal if you ask me and the way I am going to go with a set of Todd's pistons he mentioned in this thread and the 6.7 rods.
Todd

1969 Ply Roadrunner, 383 4-speed on street tires. 3,830 lbs race weight. Best 1/4: 13.1 @ 106.83 440 & overdrive 4 speed going in. 2005 Power Wagon 35X12.5 KM2's