you sound like you wnat ot keep it stock, in which case if i wanted to keep my monte stock i would definitly drop in another 3.8, even though the supercharged versions are better. if you plan to race, by all means get a 350, but you want a stock look. i say try to rebuild the engine that is in it. check out the other engine real carefully, and if it appears to be in good shape, you could probably use the alternator, compressor, power steering pump, and the etc. if they are the same.

 

If this van used the same radiator my car has I could use it. Mine has a pin hole in it.

But I have to agree with some info a friend's wife gave him.
"Do you want to trust your engine to a $25 radiator or a new one you know is good?"

I can get a new OE radiator at NAPA for around $170.
Kind of a no brainer.