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This is a widely ask question by many DIYers so I've set it out in point form so whom ever needs it may copy & print it out for future use.
TB42 Tappet adjustment.
Adjusting Intake and Exhaust Valve Clearance
Adjustment should be made while engine is warm but not running
1. Set No. 1 cylinder at top dead centre on its compression stroke,(with timing marks aligned remove distributor cap the rotor button should be pointing at number 1 ignition lead position in reference to the distributor cap if its not rotate engine 360 degrease) and adjust valve clearances 1,2,3,6,7,10
2. Set No. 6 cylinder at top dead centre on its compression stroke, (with timing marks aligned remove distributor cap the rotor button should be pointing at number 6 ignition lead position in reference to the distributor cap if its not rotate engine 360 degrease) and adjust valve clearances 4,5,8,9,11,12