Help again!!

Mike,
I am really not sure why you want to take the 7.25 rear out to begin with.
I have one in my hopped up /6 Dart, with a 3.55 gear, and flog it all the time with no issues. The rear in your car will take almost anything you will be throwing at it with the slant, and if it doesnt, and goes, then upgrade to a bigger unit.