Thanks Toolmanmike, for the Comp Cams part numbers, and also thanks AUSA66, PAC may also have parts that fit.
I haven't decided on a cam yet, or even that I want beehive springs. I'm building a moderate street 273. I'll be using a flat tappet hydraulic cam with sort of middle range duration and lift, and probably around 110 LSA, for a torque peak at 3000-3500. I was just reading about beehives and went looking to see if they were even an option for an LA with 3/8 inch valves. I didn't find anything, though I guess I didn't search very well.
Conical springs are also interesting, though I don't know if they're really better than beehives or not. Not that I'm expecting that beehives make much difference. Thanks again to everyone who responded. If anyone knows of any more, keep 'em coming.
