About rockers:

How do I know if I have the HD stamped rockers or the regular ones? My motor is an HP motor, but I don't know if they automatically came with the HD rockers.

Are any of the stamped rockers going to be reliable with a cam around .550 lift and beehive springs?

I bought some 1.6 PAW aluminum roller rockers on clearance, but I am starting to have second thoughts about that after reading so many horror stories about aluminum roller rockers (other than the super high dollar ones.) I am also concerned that a .550 lift cam with 1.6 rockers may put a lot more stress on the valve guides causing them to wear out too quickly.
For this car, I am looking more towards long term reliability than to a few extra HP on a dyno that this motor will never see. Of course, everything is a compromise when you're looking for more power, but this motor needs to be just that...a compromise between some nice power and some docility and reliability.