My car has roller rockers..
Nice.
Would love to quiet it down.
Proper adjustment will help,but if you have a bleed down lifter in there they will click at idle.
Not sure how to correctlly adjust them.
Has been covered many times here.
Do you think i can just buy a stock rocker setup and just change them out?
Yes, will work just fine will not make as much power as properly adjusted rollers do to rocker arm ratio.
Noty sure if i need the adjustable rollers the cam is a 508 lift i dont know the duration.
It's hydralic also.
Adjustables are recommended by the cam manufacturers but you can run the stock stamped one and it will run just fine. If its just a street cruiser you probably wont even notice the performance difference. if you have a bleed down type lifter in there (rodedes) it will click at idle even wih the stock type rockers.