Once you get tired of the 270/292 - which ever you end up putting it on ( time to "fess up) and you have some tuning down pat. With a simple s/w update your MS will run a 4200. I can give you a tune up file - stick it in and turn the key...
All the EFI wiring moves over easy, the fuel plumbing would need a minor change - the rest is all mechanical.
Last edited by efi-diy; 03/11/0902:38 AM.
51 GMC 4.2 turbo Can't solved today's problems using the same technology/thinking that created them
of the 270/292 - which ever you end up putting it on ( time to "fess up) and you have some tuning down pat. With a simple s/w update your MS will run a 4200. I can give you a tune up file - stick it in and turn the key... 
