9" or 10 bolt?

[gmcdermit1]

I know this may seem like a silly question but I have a dilemma. I have an 8.5" 10 bolt for my 79 Trans AM but I don't know if I should use it or get a nine inch. I have used the ten bolt for years, literally abused the thing and it held together. I am going to do a fully custom rear suspension and will be cutting the perches off. It is a factory disc brake ten bolt out of a 79 SE Trans AM. I won't be using the brakes so they don't matter.On one hand I hate to cut up a rear end that someone may really need and on the other it works, would be pretty stout with a TA performance cover and some good axle shafts and it's already got a posi. I'm on the low buck thing here. They say a 9" out of a torino or ranchero will work. Also a 1971-2 or 3 Mustang. I need 61.25" overall width to be the same as my stock rear end.Any Auggestions?