considering 'timing' has to do with the relation between the pistons and valves the best way would probably be to finish assembling the engine and then follow the procedure in the shop manual
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics