A couple more pages with related info:

• Adjusting hydraulic lifters
• Valve train points to check
• Valve spring installed height

When assembling a valve train, attention needs to be paid to ALL the components. Some respected names (in alphabetical order):

Springs:
• PAC
• PSI

Pushrods:
• Manton
• Smith Brothers
• Trend

Retainers
• Crane
• Manley
• Manton
• PAC
• Victory-1

Studs
• ARP