looking at an engine primarily for the block. wondering if the injection setup has any value in our environment. of course it can be made to work. is it worth doing?

Ayuh,... I think you'll find, many of the bits, 'n pieces are the same, but the entire injection system is Not,......

The stock truck L29 injectors suck . too small. The stock truck programming is very conservative , but I think it would work OK.

Yep once you plug the return line and find the majic injectors for merc app .or crusader or what ever .and verify the lower plenum is cast iron ..and fab egr block ..some l29s used that funky throttle body spacer too.
but yea its worth something to somebody .especially if you can confirm the injectors flow equal