Go ahead and swap out the 350 for a 455. Save the numbers matching motor and trans if you intend on restoring or selling the car. If you are concerned with maintaining the value of the car as a classic all you need to do is save the parts that would be needed to resore the car back to original. Just my two cents.
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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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