68 mustang code 63 ?

I have a 68 mustang fast back I intsalled a 90 5.0 efi . Motor is bored 30 over E303 cam 192 intake 160 exhaust 3 angle valve job . 70 mm mass 65mm throttle body . T5 trans 355 posi . The motor runs ruff set timing to 14* I set the tps to 99 also all the way down to 95 cleared the computer after each fault code reading . Still getting the faultcode 63 can anyone help me with this .
Jim

You might want to move this to the tech section or a newer mustang section where they actually came with this EFI setup.....Looking up codes for a 68 mustang is usually about what colour the interior was or what engine size it came with