All of these issues are solveable, but very real and valid concerns. Looking back at your original post it sounds like the idea of putting the 6.2 in (as opposed to some other engine) was the fact that you had it sitting there.
If that is the case, you will spend far more making the diesel function than just buying/installing something like an LS or an SBC that will give you dramatically better performance than your tired I6. Doing a gas V8 swap is pretty common and comparatively simple/cheap.
If the goal is to make something unique, go nuts but be aware that it will be a lot of work (and $$$) and might or might not turn out as well as you have pictured in your head.
If you want to go into details on that, moving to the HiPo forum would be advised (
HiPo Forum).
