I vote for the newer Comp grinds like the retro 509 grind.If you open the ports up with the templates that 509 will really wake that 383 up
Gus

5332256-READY2.JPG (297 downloads)
64 Plymouth Savoy
493 Indy EZ's by Nick at Compu-Flow
5-Speed Richmond faceplate Liberty box
Dana 60