It's a standard Saginaw pump--not a big deal to get, parts stores have them as do various places online.
You might have to mess with wire length some on the switch, not sure, but pretty much anything with the right threads should work fine. It just makes a stronger/weaker ground on the block--nothing too special about it.
Maybe you should give in and get a high performance y-pipe and headers while you're in there
Assuming you have the funds that is.
If you do take it off, make sure you put a copper gasket on it. With the copper ones, if it starts leaking, you can simply retorque the bolts on the header, and it will seal back up, every time. You shouldn't have to buy exhaust gaskets for it again.
'71 Wagoneer (DD)
-B350 (HEI, iron 4-barrel, Edelbrock 1406), TH400, D20
-'74 D44 front (nonpower discs)
-custom headliner
-Front shoulder belts (rears eventually)
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There are 2 major differences between new Wranglers and FSJs. FSJs are meant to be both utilitarian and capable, not just capable. FSJs are also rarely initially recognized as Jeeps by the average American.