Avoid cranking the engine over unneccessarily. Make sure the carb bowls have gas in them. Bring #1 cyl to TDC on firing stroke (puff of air out sparkplug hole) make sure distributor rotor is pointing at the #1 plug wire. Make sure there's water in the radiator. If you have two shop fans, point them at the sidepipe body exits to avoid cooking the paint during inital fire up.
As soon as it sparks off, bring the RPM up to 1800-2500 range, vary it in this range for the first 20 minutes of operation to break the cam in. WATCH THE
OIL PRESSURE. If it heats up to where the water is above 190 degrees shut it off and repeat as necessary to get 20 mins of 1800-2500 rpm break in.
If you have an
oil cooler or remote filter adapter, prelube the system prior to fire up. Remove distributor and rotate
oil pump drive shaft with socket on an extension until oil pressure gauge sees some pressure.