25 gallon Fuel tank in a SWB?

[jadedbird]

Just putting together a rather large parts list for a build.

I'm looking to run a 6.0L truck motor and want a larger gas tank.
Specifically I wanna run a 87-91 Suburban or Blazer 25 gallon tank part number gm15c or rtg9125 so I can drop in a AC Delco EP381

But the tank ooks to be 10" longer and I'm concerned it won't fit length wise between the QA1 rear end assembly (specifically the panhard bar) and the furthest rear crossmember. I do plan to raise the bed 7.5 inches so the hanging depth is not a concern.
Just wondering if anyone has done this?