off the top of my head, in order:
6bta, 6bt, dt360, perkins 354, 4bta, Isuzu 6 or 4, Ferd 7.3 PSD, DD 4-53T, Ferd 534, Cheby 427 Y, Cheby 305 V6, Ferd/Cheby/Dodge big block, Ford 300 I6, Dodge small block, Cheby small block ....
any of them are better candidates for "long distance...