[DieselSJ]

In general, the old school SBC will make better power down low. **IN GENERAL** (emphasis added for the LS guys who are going to cry because I said that) The LS does make great power but they need to rev to make the power. Yes, you can spend the $$ on turbo or whatever on the LS, but you can do the same thing to a SB with the same result.

How are you going to use the truck?
What is your budget?
What transmission are you going to run?
Tire size and gear ratio?

I know there is the argument that the LS guys love to use about how dependable - turn the key and it starts and runs always. The SBC in my old Jeep did that for 150K miles. The BBC in my dually has done that for 110K miles so far. Anything is dependable if you make it that way.