i have a 84 ae86 with a 1.6 single cam and it has 300k miles on it. I found a guy giving away a 85 1.8 3T engine. It looks nothing like my engine. I didn't even see a cam gear sticking out of the head what is a 3T engine? is it a good engine? will it go into my 84 ae86? is it single or twin cam? cam anyone help?????