They are supposedly are a great alternative and create very similar numbers equally equipped (6.0 iron truck vs. LS2 both having the same acc/intake/cam). You swap one in just like you do any other LSx, however, the truck intake and acc may not fit in your vette. I know they don't in a C3. If the intake/acc won;t fit, you need to convert to another group that fits like the Fbody. So if they intake goes, so does the fuel rail, injectors, etc. I believe the water pump doesn't fit with either an LS1 or LS6 intake. But you need to get rid of the pump anyway for the acc swap over. I don't think a lot of it is convertible (with different pulleys, for example). I priced one out with all the conversion stuff needed to convert the engine to an LSx clone and it didn't wind up cheaper than a swap package (all acc, engine, trans, harness, etc). That is why I went for an LS1 instead of a 5.3l or 6.0l. Once again, LS1tech in the conversions section has been very helpful for all of this. It is very doable.
