Insight needed for deciding on a gas tank

[Bret B]

Decided I'm going with an under bed tank. The dilemma I'm having is, which tank "kit" to go with. The search function works, and I've looked thru at least 4 pages of threads back to 2009. What I've found is, most people who've done the under bed tank have used a bed fill location, and the same majority have fleet side beds. I've got a stepside, so this by itself narrowed the threads to a hand full, and again of those even fewer have done a side fill. There are more threads in the 67-72 section for side fill and stepsides which is good and helpful, but they have the extra light they can hide the filler behind, etc.

Here is what I need help determining; of all the tanks there are a few who offer a side fill such as Boyd's and LMC. LMC limits the side fill to 17 gal and Boyd's says 67-72, not pre-66 (even though frames are the same). What tank fits better, meaning hangs down the least? Which "kit" is more inclusive? I've already had my frame blasted and painted, so I'd prefer not to remove the rear most cross member for installation of any tank (I know, should have thought about this before). Is the spare tire cross member the only one which needs to be removed? Any pictures of side fill for stepsides would be greatly appreciated, including the final routing of the filler neck and filler. I've only got a mild sb 350, and it will be years before moving to fuel injection. With that said, which tank kits don't allow for fuel injection later on, meaning have to buy another tank or complete pickup/pump?

Thanks guys.