header help, need to make sure i don't melt my motor Options

[werd]

hey everyone I'm new to the forum and 914's. I recently got a 1974 914 1.8.
Iv never owned a 914 but when I saw this one i had to have it. The car has headers and exhaust on it and it sounds great. my concern is is that all of the heat exchanger stuff is gone and I'm not sure its okay to just leave it disconnected. Is there anything i need to do or block off to make sure there is enough air blowing across the motor to keep it cool?
I did check the thermostat thing to make sure its working.
There are 2 rectangle flaps on the bottom of the fan housing that are missing. Should i block these holes off? Thanks for any help you can give me. I live in nc and its hot!!! I don't want to mess anything up.

[era vulgaris]

I would agree with Jake. Blocking any aspect of the cooling air flow that isn't normally blocked seems unnecessary. What does it matter if the air exits the fan shroud straight to the atmosphere; or if it exits the fan shroud, moves throughout heat exchanger, and exits to the atmosphere via a closed flapper box? I don't see a difference, and if Jake has the data to prove it then that's good enough for me.
I would agree with blocking off the top of the J tubes to prevent hot air from entering the engine bay. But the OP said he has no heater tin or heat exchangers, so that's a moot point.