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i have read the threads on here about 3500 top ends on 3400 engines. i see were the newer 3500 engine using the 3900 block won't work but about earlier 3500 top on a 2000 3400. i am sure it will but i would rather ask. if so what if any mods would be needed to make it work. been off of here for awhile. trying to get up to date.