http://www.roadraceengineering.com/mitsumo...pplications.htm
thats a list of the mitsu motors (4 cylinder).
summary:
89-91 hyundai sonata 6 bolt 4g64.. g4cs is the best option
others:
85-87 galant 6 bolt 4g64..
90-92 expo 6 bolt.
make sure they are the 12-1/4" bellhousing.
2.3L option: Complete hack job imo, poor rod ratios, and a bad option.
2.14L good rever

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MATT R:
What has to be modified on the vehicle to accept this block?
NOTHING
What has to be done to my current bolt ons to work with it?
NOTHING however a larger turbo would be most benifitial
What has to be done to my head(1g 6bolt)?
NOTHING
Does anything electrical(ecu, etc) need to be changed?
Knock sensor has to be re-tapped, various methods are used ranging from new locations, to threading it in spots, to using freeze plugs
What vehicles(specific years and models, 6 bolt only) use this block?
see above
Where are they being found(locally, shipped, etc.)?
most local sources are tapped (sorry guys, we have gobbled them all up) and most are around $400 unless you really shop around
About how much are a good block and crank going for(on average)?
$400 for the entire motor, if you can get them to bargain, most give you $100 off the longblock if you just take the shortblock
Is there anything else one would need to know about doing this swap?
nothing especially except the list of parts that are compatibile etc..
just do some more research.