Oh No.......pull the spark plug on the number one spark plug (passenger side front) stick a screwdriver in there and rotate the engine by hand (turning the crank with breakerbar) to TDC of the compression stroke. Drop the distributor in slowly making sure that the rotor points to the number one spot on the cap. That should get you pretty close...you'll need a timing light to get it right. Pull the spout connector out and adjust the timing to 10*BTDC if you want to go back to stock settings.
Burt- 1989 Ford F250 7.3 NA, Zf, 3.5" Straight Pipe Exhaust, 2001 SuperDuty Axles With 3.73 Gears, 5" Lift Using All Factory Parts, Captain's Chairs, G31 Batteries, NorthStar NS3000 CB With RK56 Mic & 102" SS Whip, Aircraft Landing Lights & 102dB Backup Beeper.