LA w/ stock valve spring magnum heads - maximum lift

I talked with Hughes they reccomend to magnum heads >> 1110 springs, 1278 retainers and 1307b locks. They tells the max lift would be about .550 to .560 without cutting the guides down with this setup. Very nice.
I'm waithing theyr answer about the 1102 valve springs (I have this springs, I was thinking in the 1110 but after a check in the box, saw they are 1102), I couldn't find info about these springs in theyr site.

thanks