I have been wondering if later model pumps would work in our old Stangs as well since I am tired of having mine leak.
For your application Tedbo, it should work fine assuming it already fits the motor. Are you using a serpentine belt or multiple V belts? But as far as line pressure goes, it should be the same. I have been using the old style pump on my Mustang that has a newer style rack and pinion in it, so I am guessing if you went the other way around that would be ok.
Another dilema could be the hose connections on the newer pump. If they are metric fittings, good luck! I had to make a custom line/adapter for my rack swap to use my old pump, but it works fine with no problems.