Chuck, just in case it's too long, and you desire a multi-port
fuel-injected engine with similar displacement and lotsa power, GM made a
little-known-about 4.3 liter v-8 which is significantly shorter than the
4200 inline-six.
   It came in the full-sized Impala/Caprice, about 94-96, and like the
4200, was a TPI: tuned port injection--NOT a TBI:  throttle body injection.
The engine looked almost identical to the 5.7 TPI in the 94-96(& possibly
other years) 'Vette, Z-28, Trans Am, and Impala/Caprice.  Should make a
super project engine with small displacement, good power and super fuel
economy--even approaching 30mpg/highway.  Wiring retrofit should be as easy
or easier than the less-experimented-with 4200.
   HTH & good luck.  And don't let anyone make you believe this is a
misprint!!!  Keep in mind that if you need more power, the 5.7 TPI will have
almost exactly the same outside dimensions as the 4.3 TPI and easily up
to/above 300 hp.  Plus, either of these v-8's should deliver better economy
than the 4200.    sdlomi2