My original blower motor continues to blow fuses as it draws more current.
I have a late model (1989) motor, fan and shroud and a couple of harnesses
for it.

My questions are, can you do this R/R with the radiator in place or does it
need to be dropped, and how do you deal with the wiring?

The early models like the one in the car have the wiring going internally
to the motor, the later ones have terminals. Any other differences to look
out for?

Jim