Vander, One possible problem is the transmission. For 64 it would have been a Hydromatic 4 speed, but for 65 a Turbo 400. And the filters are not the same. As for the rest, you should be fine. Rick
as a correction, the Turbo 400 trans was introduced in ‘64 for deVille, 60 Special and Eldorado series...old Hydramatic still in Series 62.
Is it me, or is it hard not to just love the look of a '65 Caddy? There is a hint of '50s, a chunk of '60s as well as a look to the 70s styling all in one. Clay/Lexi