Is the blower motor location for an air c. vs. non-air c. in a 67. I replaced the heater core in my factory ac car and it look like the blower motor is under the middle of the dash but i see some cars with a motor sticking out the firewall. I just want heat. do the hoses go straight from the engine to the core, what is the valve looking thing on the firewall. Any info helps. Thanks 
I only know about 69/70’s but thinking they are the same in this regard, that being non-AC has the motor sticking out through a hole in the firewall, AC the motor is under the dash and there is a plate on the firewall. Also, there is no heater control valve in the hoses on non-AC, there is on AC. The valve shuts off water supply to the heater core when AC is being used. If you don’t care about AC, you don’t have to use the valve and could go direct to the core. If you do care, the valve is supposed to be used.
The boxes are completely different under the dash. The controls are not compatible either. Your best bet is to stay with what you have.
Thanks for the info guys
That valve is to reroute the hot water back to the engine block when the AC is on,…away from your heater core/AC coils. It’s a bypass valve. Try tapping on it with a screwdriver handle with the heater control ON…it may be stuck closed!
Pics can give instant solutions without all that extra explaining work and heavy thinking. Just saying.
Thanks. I ordered a shop manual to get a better idea of the parts. I am planning on bypassing the bypass