8 1/4

Hey guys.

Just a quick question.

83/4 are near on impossible to
Find in the UK with out paying
Mega money.

How ever, I have been offered everything from
Prop back for a 8 1/4 with open diff for a very good
Price.

Came of a 72/73 dart I believe.

Don't know much about these type, was wondering if anyone can give me a
Few pro/cons between these and the 7.1/4 and 8.3/4

Currently using a 7.1/4 on the rear now, an been told these are no
Good for any mild v8 4 speed manual.

Worth changing over etc?
How capable are they power wise?
Can Play around with them at all?
Need any work to fit a 70 dart?

Thanks

Sam.