Can I just plug the coolant outlet on the front of the manifold (not the one on the bottom of the throttle body). I am not using a heater and would like to just plug that outlet. But I am worried that may disrupt the proper flow of coolant.

Any help would be appriecated

 

If you're talking about the 1 that the heater hose connects to, then YES.
When the heater control valve is shut off, then there is no coolant flow there anyway.

 

I thought I could but I didn't feel real confident,

good point. Thanks for the feedback.

 

The only other thing to look at is the radiator. My car has a heater hose going to the radiator, so after you plug the engine, you may have to plug the Rad. When I replaced mine a few years back, it had a rubber plug with a hose clamp holding it on. You can find one at a good hardware store or a radiator shop.....if they are still around. Other than that, you'll have no problems. Her's a pic of the plug and where the rubber cap goes...just need's a clamp.