Here is what I have got for valve adjustment on your engine.
Adjust the valves when the lifter is on the base circle of a camshaft lobe:
Crank the engine until the mark on the crankshaft pulley lines up with the O mark on the timing tab. Make sure that the engine is in the No. 1 firing position. Place your fingers on the No. 1 rocker arms as the mark on the crank pulley comes near the O mark. If the valves are not moving, the engine is in the No. 1 firing position. If the valves move, the engine is in the No. 4 firing position; rotate the engine one complete revolution and it will be in the No. 1 position.
When the engine is in the No. 1 firing position, adjust the following valves: Exhaust - 1,3 Intake - 1,2
Back the adjusting nut out until lash can be felt at the pushrod, then turn the nut until all lash is removed (this can be determined by rotating the pushrod while turning the adjusting nut). When all lash has been removed, turn the nut in 11/2 additional turns, this will center the lifter plunger.
Crank the engine one complete revolution until the timing tab and the O mark are again in alignment. Now the engine is in the No. 4 firing position. Adjust the following valves: Exhaust - 2,4 Intake - 3,4
Feel free to contact me with any questions! Good luck!
Has this cylinder head been cut down? And mody that would affect the deck height or cylinder head mounting height?