Early 904 rebuild

Costs for 4 speed:
Pedals, clutch linkage, bellhousing, flywheel, clutch & pressure plate, throwout bearing & pilot bushing, shift linkage, floor hump & carpeting, driveshaft, and more that I'm probably forgetting... Oh yeah, the transmission.
The floor hump alone for a '65 is nearly impossible to find, and when you do, $$$.
Your 904:
Deep pan, pickup extension and pan gasket with filter kit: I paid around $40.00 last time I got one, if you shop around.
For instance: RT Off-Road Transmission Pans RT24001
Your call, but if the 904 is in decent shape otherwise, I'd just readjust the bands, put the deep pan on and go have fun.
I love 4 speeds, but converting is a project. Just hunting down all the proper parts can be exasperating, and expensive.