What valve springs did you use with your Isky E-4?
I had to think on the Beehives a few minutes, since they are kinda past my prime.
Personally, they just don't look right to me. I know they come on some of the newer engines these days, but for what most here do with these engines, i don't know that it's worth the fitment issues to go that route. The only advantage I see is a little lighter retainer and maybe a little extra rocker clearence. Back in the day we just used titanium pieces. Pricey, yes, and I don't know what the comparison would be vs converting to beehives today. I'd still use the "old school" springs if I was to build a engine today.
One thing to consider with the Comp/Crane springs mentioned earlier, is that depending on the cam lift, they can be shimmed for more seat pressure if it's needed without getting into coil bind.