David & coach, thanks for the suggestions, but it isn't the motor mounts. the mounts are good, the transmission is solid, and so is the bell housing. the U-joint has a little bit of play, but it's to my understanding that a little play is okay.
The engine shakes a little bit, as all engines do a little as they run, that part is okay. What I've noticed is that every couple seconds, it shakes a little harder once, then is normal. A second later, it does the same thing. Could it be my distributor points or the timing maybe? I don't have a timing light, but I'll see if I can get my roommate's timing light tomarrow to check just in case.
Thanks again for the help.
1968 Camaro (327ci/TH350)