318 to 360 swap

Ok, so I'll get the motor mounts you guys suggested. I'm not sure what transmission I have, was the 904 the only tranny that would have come stock with the 318 model for 68? and if so how much power could it handle before I've got to worry about beefing it up? I'm just thinking to have a mild 360, nothing much over the factory #'s if at all, would I be ok running this setup? I'll build it up in a few years after I'm done with grad school and can afford to get a new tranny/rearend combo too but for now I just want a fresh engine with a little more pep than the 318 gives me.