'65 904 Torqueflite: No Start in "N", no forward or reverse.

Your convertor will fill in N but not necessarily in P. Start it, and put it in N, allow it to idle for a few minutes, Then run it through the gears a few seconds in each gear. It should end up between C or H on the dipstick. I filled a C4 with 8 qts and 2 ran out the vent on top of the case. It was not started as recommended. Convertor never took any so it overflowed. The spool valve allows the convertor to fill. Hard to mess that up in a rebuild. Wont fill if the pump is not engaged.