Hello, my name is Brandon. I bought a 1988 Toyota All Trac that is overheating. My mechanic said it is getting aeration in cooling system under load. I am totally new to working on Japanese cars. I would like to know what options I should look at? Do I go further to see if it is a BHG or something else and repair what I have. Or do I look into engine swaps. What are some options for changing the engine or trans or both. Do I stick with the ST165 or what possibilities are out there for swaps...ST185 or ??? I appreciate any help I can get as I am new to these cars. Sorry if I sound like a newb....I have posted some pics in the introduction area of the forum.