Those 4.3's are great as long as they have oil. I understand how you feel about caring for an engine and having one thats great, but remember you also didnt buy the old one new either.
I would take the replacement after a little checking out. I highly recommend having the cooling parts changed out on the replacement, new GM tstat and quality water pump
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'02 E-350 7.3 Diesel (Work Van)
'91.5 Cummins 4x4 (Old Blue)
'00 Jetta TDI 5spd
'22 Tundra TRD OR
'04 RX330
'05 Tacoma 4x4
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