I think you would be much happier with a 2 hole TBI off of a 305 V8 mated to a offy alum 4 barrel intake manifold. Then use a Megasquirt to run the injection . www.msefi.com Total cost for the system including pump etc should be <$750.
51 GMC 4.2 turbo Can't solved today's problems using the same technology/thinking that created them