What can the 7.25 handle?

do not rely on the 7 1/4. they were marginall ok with highway gears install and a slant. that is it. A better option would be the 8.8 or actually an 8 inch ford out of a 60's mustang. perfect width on the 8 inch rear if you can find one. the 60's mopar B body could work also but is slightly wider.