What exactly is your setup? Depending on your CR, and other specs - OBDII will compensate the correct AFR to a point. I wouldn't drive it without tunning, but for initial startup you should be fine.

First thing, crank it over enough to build up oil pressure before you start it. And use non-detergent oil to seat the rings. It's also best to start it with the rad. cap off in order to prevent air bubbles from causing over corrected timing and an erratic idle.

Good luck!