Conversion suggestions...

[Padgett 0sirius]

>> He has a 1980 Dodge Van with a 225 slant 6.  It has a Holley 1bbl carb and
>> runs like crap.
>> He wants to go with EFI, but doesn't want to go Port fuel injection unless
>> there was a manifold/fuel rail made for this engine from the factory
>> (afraid to try and cut it up!).

There was a factory 4bbl manifold (AFB) for the slant-6 back in the 1960-61
timeframe. The runners were a bit better design than the 1 and 2 bbl
versions. Dunno how hard one would be to find but would probably be your
best place to start.
      	A. Padgett Peterson, P.E. Cybernetic Psychophysicist
 Anti-Virus, Cryptographics, & Antique Radio Researcher
http://www.freivald.org/~padgett/index.html
 mailto:padgett at gdi.net     PGP 5.5 Key on request