What is this under my car, Duct tape covering hole? Options

[tmc914]

Hi all, trying to get my car all sorted out and was wondering if anyone knows what this duct tape is covering up? There is one on the passenger side and another on the drivers side under the car near the engine. Is this something to do with the heating system? The heating system doesn't work and I know I will need to add parts like hoses and flappers, the car does have heat exchangers.

[barefoot]

Here's what's supposed to be there, the ducts that send fan air into the heat exchangers that goes for cabin heat. When he flappers are closed (no cabin heat, the hot air in directed down under the car.

[bdstone914]

Here's what's supposed to be there, the ducts that send fan air into the heat exchangers that goes for cabin heat. When he flappers are closed (no cabin heat, the hot air in directed down under the car.

That looks like an AA picture with the wrong J tubes. Everything else is the 70-74 style parts. The J tubes pictured are75-76 square ones.
It has been shown that it is better to leave them open if you do not have the heater parts to hook up. Blocking them creates air flow disruption to the engine.
They are supposed to blow some air thru the heat exchangers atall times. When the heat is not on the air blows thru the heat exchangers and out the flapper valves to prevent a high temperature build up.
Just remove the tape and you are fine.
You are also missing the warm air guides that are the plates that go between the engine block and heat exchangers. The one on the drivers side helps with the thermostat operation by blocking under car air from mixing with the warm engine air.
If you want heat I have the S branches, J tubes, flappers and related parts.
Did they block the large holes in the cylinder tin for the J tubes ? If not the engine fan will suck hot air from below which is not good.
How about a top picture of the engine. I bet other parts are missing.
Bruce