I need help putting the wires back in their correct location! I couldn't remove the wires from the old control so I just disconnected them all at the other end. Now having the new control, I forgot where the black and white wires went on the indoor blower relay. My gas furnace is an old Lenox from 1973. Help!

If 24 Volt transformer is used, Then, with wires clear turn on power measure voltage on wires, 24 volts would be control wires to contactor(relay) coil.
The Contacts, One side will go to blower, the other, from power.
Follow the wires with power off.