Wouldn't that truck have been equipped with a Babbit 235 originally? As long as the rods aren't in bad shape, at least consider resurrecting it with the original engine. With proper oil clearances and rod squirter tube alignment, the old Babbit-pounders are pretty good engines. It's also possible to machine the rods for insert bearings.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!