As far as handling is concerned with the 62 thru 66 Thunderbirds go,,,They were built for cruising the highway with extreem comfort,,,replace the bushings, ball joints and shocks, Then take it for a spin and you'll wonder why you ever considered switching.
And even though the disc brake conversion is nice,,i gotta tell ya,,,the front drums give me plenty of stopping power,,and if i want more,,i can alway's go oversize on the wheel cylinders.
Needless to say,,,,,I love my Birds.