The 8 1/4 thread

I may be in the market for an 8.25.
Is there a list of donor cars/trucks I should be looking for?
What I am trying to do is find the least expensive path to replacing my 7.25 that is currently in my 68 barracuda with SBP. I have a 8.75 SBP and a 7.25 BBP. If I keep my 8.75 I need to buy axles with BBP (Dr. Diff) But if I can find a 8.25 with BBP then I can sell my 8.75.
So long story short.
What donor cars should I look for to swap an 8.25 with BBP into a 1968 barracuda that currently has a 7.25 and a 904?

Thanks