Dual valve springs stock on 2.02 915 J Heads?

.060" is kinda the safe norm these days...which is why RRR said to check and re-check. In 'ancient times' LOL, .100" was often recommended.

Do you have your retainers you will use and have you checked the distance between the retainers and the valve spring pocket to see where your installed height will be? You really ought to measure that 1st and see where you are.

Also, be aware that your lift will not actually be .525" but probably around .510-515" when all is said and done, with the losses in the geometry. So you get a bit of margin there. All those things together might get you to .060" or very close.

The +.05" locks would be a good backup option, if they work with your retainers & valves. Easy to buy those at the last minute and use them if needed, once things are assembled and checked. But I wold insure compatibility 1st.