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Mine had a blown 305 and I was able to get a 350 from a friend's station wagon. I think mine was a 1985 and was fuel injected. I said 4.3 because they put them into full size trucks so figured that would give you the power you needed. There are also many aftermarket products for the 4.3 and will fit your current transmission. If the van has just a 3 speed transmission you could put a 700R4 transmission giving you overdrive. Other issues I was thinking of would be rust, especially fuel lines, brake lines, exhaust. Being in New York that stuff is not fun to deal with. Not sure how much of the emission system you need to have hooked up or if there is a cut off year for emission inspection. Probably just swapping over to an aftermarket fuel injection system would boost your mileage and power. I was once a carburetor only guy but now am seriously thinking of converting my Chevele to TBI. What did you mean by the radiator block?
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