318/360 production info

I'm tossing around the idea of replacing the 273 in my car with either a 318 or 360. This will be a bone stock motor as I'm looking for dependability.
My question is what year casting should I be looking for? Some sites tell me the L.A. motor was made from 67-76 others tell me something different.
I want a drop in motor/trans but need to know what years I should be looking for. I would like to retain my 65 trans and know about the bushing for the converter
Thanks for all your help, Dan.