Ah the age old question....What is this for??

[xero_gto]

Well maybe not the age old question, i have my thoughts on what this is for. I'm guessing its a recirculation for the crank case. My main question is do i need it? Since i just installed my new summit carb, it wont fit on the new air horn. So i just threw a regular breather on, and now i get an excessive amount of smoke coming from the breather. Is this normal? or is that a sign of significant wear on my engine? Also i did a massive search here and various other websites as to the plumping of the heater hoses. I just installed my new heater core and im trying to figure out the correct plumping. here are a few pics of the recirculation to the air horn off my old carb, and the various locations for the heater hoses on the block. Can anyone please make sense of all this for me? Thank you in advance.

the air horn adapter.


where the adapter originally connected


heater hose connection points.



what the book shows.


note: i have no heater hose connections on my radiator, they only seem to be on my water pump, and my intake. im assuming the large plug on the water pump is for a bypass/block heater hook-up, and the small one on the side could possibly be a return considering the flow of water?? i'm not sure, yall are the experts here so i will go off the best advice given.