OP, if you are mechanically inclined, you can do the injectors on a LB7 yourself and save a ton of money over the later engines when you buy the truck. But you really do need to plan on doing the work yourself.
I own two LB7's and love them both, one stock with a medium tune, and one built. In terms of absolute fun, a stock LB7 with a decent tune and a built transmission is an absolute blast to drive. But in terms of fun per dollar... a gas engine is a better value.
I drove a 1999 C2500 for work back in college, and I loved that truck! Makes decent power, sounds great for a stock engine, and the truck would take a beating and not even care. I still keep an eye out for a clean used one, but no one seems to sell them.
I can do the work myself I have a small shop with a four post lift so working on it isn't a big deal but if I will have to fix it more than a gas I think I would go with the gas.
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