[special-K]

I agree with cell.If you`re not going the easiest route by tossing a GM 6.2 in,then a 4BT is a cheap and simple swap.The idea is,if you have to spend thousands then it won`t pay,not in an old truck.The 4BTs were installed in box vans(StepVan-style)and many were on GM chassis mounted to GM transmissions.They don`t pump the big horses,like just over 100,but can be tweeked (turn-up I/P) to around 150 real easy.Beyond that,I`m not sure.Although,they are the 6BT w/2cyls lopped-off.So,maybe other mods for the 6 can be adapted.Gettih`back into the money again,though.For around 6 grand a 6.2 can be built to put out right about 200 reliable non-turbo horses.That price includes a complete rebuild,of course.The 6.5TDs are rated @ 195 stock.I have a friend with an`82 shortbed with the 6.2 I`m talking about.