904 transmission installation

Next weekend i will be taking my 904 out to do a band-aid job of replacing the front seal. With a 1965 dodge, are there any tricks i should know about the transmission before attacking?

I'm also still on the hunt for a 904. IF i were to find one NOT from 1965, could i modify it so i can use my stock cable linkage from 1965?

AND i wanted to know about the transmission kickdown.. does anyone know the adjustment on that? I have a quick shift through first and second, so im loosing a TON of power on that.

thanks guys