Anyone using beehive valve springs on a slant-6?

I'm hoping so!
You didn't spec a prospective camshaft, but just some food for thought, the 3.3/3.8L 60deg Mopar V-6 uses Beehives OE, the valves are 1.79/1.48" dia., and have 5/16"
stems. They are a bit too long however, 4.95/4.97", to the 4.78/4.80" OE's. But, depending on where the retainer grooves are, they may be able to be used. The installed
ht. on those are nominally .030" less than the /6's OE spec,..easily shimmed if needed.