Fuel pump removal on 81Blazer with 305

Hey,

So I just replaced one on my Jeep and it took me about 30 minutes.
I figured I'd help a buddy with his fuel pump on his 81 Blazer with
the 305 engine.
Well we can't seem to even get the sucker off. The frame/altenator/
manifold all seem to be in the way. I can barely reach the bolts, on
the fuel pump, to loosen/remove them but after that I dont see a way
to actually get the pump out there. Much less I can't imagine away to
squeeze the new one back in.
Am I suposed to remove the manifold or what? I can't find anything
online about removal of this, it seems most people have trouble
getting it back on.
Please let me know if you have any insight or if I am overlooking
something obvious,

Thanks,

Jeremy