Or for a low buck efi - megasquirt II (MS II) with a TBI off of a 4.3 V6 - dirt cheap. The whole deal can be done for ~$500. Full fuel and later add ignition control - use the existing dist. with a pertronix conversion to trigger the MS II.


51 GMC 4.2 turbo
Can't solved today's problems using the same technology/thinking that created them