>>>*First note that the cam timing is correct when at top dead center the cam alignment pin is at 12 O'clock. The actual timing mark will then be slightly left at about the 11:30 position.

Rough running can be caused by many factors but note when installing the head the camshaft MUST be in time with the engine or a valve can be drawn into a piston. This can cause some valves to be slightly bent.

The results are exactly as you describe, so a quick compression test is in order first before trying anything else.

If compression tests normal, then you are looking for vacuum leaks, ignition troubles, timing errors etc.

And "EPN?" That is my company logo, Engine Parts Network, inc.

Give Tod a call at the shop or email if you keep having problems, you have our 268C, that cam design offers very smooth operation when all is correct....*EB....