I HAVE A FRESH 383 SHORT BLOCK I JUST BUILT USING 99 VORTEC 350. INSTALLING IN AN 83 TRANS AM. I WANT FUEL INJECTION. ANY PROVEN COMBOS FOR HEADS, HEADERS AND INTAKE? ANY BODY USING STAND ALONE INJECTION KITS?

You are in the parts wanted Dept
Try
https://www.thirdgen.org/forums/tech-general-engine/

https://www.thirdgen.org/forums/alternative-port-efi-intakes/

even
https://www.thirdgen.org/forums/tpi/

for advise and combos.