Re: 509-350 &509-400 Block ?
That's interesting, I thought all the 509 castings had "509" cast into the sides of them like mine. Mine is a 71 casting out of a truck.
I think your 350 block would be good to build a 383 with, but you never know for sure until you get it to the machine shop. If its standard bore and will clean up good at +.030 you are in good shape.
Personally I prefer pre-75 blocks because they were still made in USA -- I think it was 75 or 76 they started making them "Hecho en Mexico"
E85 racer and E85 carb builder
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68 Camaro, E85 powered 427" small block. 9.96 @ 133 MPH, 1.319 sixty foot on motor. 5.92 eighth @ 116 with a 1.42 sixty breaking beams with back tire on the bottle