smoking 360

I have a 360 motor that I've had rebuilt and it's got blue smoke coming out of both exhaust pipes, more so on deceleration. The sleaves were not honed because they appeared to be in good shape. The motor only has two or three hours running time on it since the rebuild. What things could cause it to smoke? It runs good. It didn't seem to smoke until it got warm. It's in a 76 duster that I have put a lot of money into. I want to sell the car and little things seem to be in the way. I've also mentioned on the transmission post sight that I need a synchronizer for third gear and need to know how much of a job that will be. It's a nice car...

Dale