[mrmustang]

disk brakes on the rear or drum brakes?
Which rear suspension set up (mustang coils, coil over shocks, 3 link, 4 link, IRS)?
302 engine with ported znd polished heads, which heads, what type of intake, etc?

You need to bring along someone who knows what they are looking at, as not all cobra kits are built the same.

Or, you can stop beating around the bush and post a link to the ad here so we can look at the specs and the pictures and advise you from there.

Bill S.