1986 Chevy Monte Carlo I need help!

5.0L (VIN Q, Y & 9) 1. Engine must be at normal operating temperature with choke fully open. Turn A/C and all accessories off. Connect tachometer to engine. Connect timing light to No. 1 spark plug. 2. With engine running, install a jumper wire between terminals "A" and "B" of diagnostic connector. Connector is under left side of instrument panel near steering column. 3. Set timing at specified engine RPM. See IGNITION TIMING SPECIFICATIONS table. Recheck timing after tightening distributor housing. With engine still running, remove jumper wire from diagnostic connector (if removed before engine is shut off, no trouble code will be stored).
5/12/2010 ...

If yours is F G or H use this firing order, notice the distributor rotates the opposite way!