Update: I rebuilt my 403, bigger camshaft, new keith black pistons, edelbrock intake beefed the old 403 up. Still had trouble with the Rochester tried everything spent a lot of money. I then looked into Fitech and bought a Fitech efi for up to 600 HP the gas tanks inc fuel injection tank, my brother works at inline tube so they designed me bigger then stock sizes stainless steel fuel line that would follow the stock path with AN fittings. Went high pressure rubber from the end to the fuel tank and high pressure rubber from where the stock fuel pump was to the EFI. Also added a pre and post filter. Wow is all i can say car runs amazing!! Looks totally stock until i take off the shaker. took the orignal intake and carb lubed and boxed them up. I was able to utilize the vacuum lines and ports in such a way that my air cleaner is still functioning and so is cruise control kit worked with AC i just had to buy a funky throttle and kick down bracket for EFI. Everything fit too. Awesome is all i have to say!