Will this spring height be ok?

Hello there!
I'm in the process of putting my cylinder heads back together for my 318. I have bought Hughes 1110p valve springs to use with my new cam. The intalled height spec is 1.660'', I have 1.640'' with the shim, which is 0.020 shorter. If these were the old stock springs, I would not care as much, but I don't know if it would be fine for these way stiffer springs. My gut tells me it would be fine, but to play it safe, I'll check here.