FM,
Other than typical shop supplies, it appears you have most of what you need. There may be some things that need attention when you assemble the parts.
* The stock rockers should work with the cam, but you'll have to check all clearances as you assemble the parts.
* Make sure the rocker stud slots are long enough to allow full travel of the valve train. The extra travel of the valve train may bind the rockers at one or both end of their travel.
* Move the engine through the full range of the valve train operation while watching the rockers and push rods and their clearances.
* Make sure the push rod guide holes in the heads allow full free movement. You may have to elongate the head holes to allow clearance.
* Make sure the rockers have adequate clearances through the full range of motion. The rockers need to have clearance at both ends of travel. There must be clearance under the valve spring end when the valve is fully closed, and there must be clearance when the valve is fully opened.
* Try to adjust the valve train to position the rockers perpendicular to the rocker stud (stock 23° heads) when the valve is opened to about 33% of its maximum.
* You may have to adjust push rod lengths. The base circle of the cam may be smaller than the original cam, and may require slightly longer push rods.
* You may also want to check the cam timing to make sure the dowel was placed correctly.
As for the timing chain, I've had good service from the Cloyes double roller sets, and many of their sets come prepared with several keyway cuts to adjust cam timing easily. The GMPP HD single roller chain set is probably equal or better in quality, but does not necessarily offer the timing options without some machining.
Good luck.
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Later,
Vader
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Justice and Freedom will Prevail 
