Josh,
The frame for the 88 hard top and the Conv are the same. The Hardtop and the Conv both used fully boxed frames. You can used one from a two door or a for door hardtop or Conv.
The frame for the Starfire will also work.
The Sedans are open (or C section) and will not work under the Conv. The Ninety Eight frame is 3 inches longer in wheel base and 6 inches longer behind the rear axle.
Pontiac, Chevy and Buick frames are different and will not work.
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1966 Ninety Eight Convertible - 425 Tri-Carb, Factory Dual Exh, Switch-Pitch THM400, 3.54 Posi.
1966 Catalina Wagon - 421 Tri-Power, M21, 4.11 Saf-T-Trac, 8 Bolt Wheels
1989 IROC-Z - 5.7TPI
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