? Valvetrain Geometry ?

I agree. I went through this with a set of Harland Sharps when I put my 340 together. I ended up shimming the stands and ditching the HS rockers as they were really designed for longer valve stems. I ended up with MP iron rockers (which were junk, BTW). Those had the correct geometry, but had .010" clearance on the shaft. I sent them out to have them bushed and they're OK now. I should have stuck with stamped rockers.

valve stem length. i had the same crane gold rockers and eddy heads and found the same problem; to far out on the stem. i saw that you have already put stamped rockers on so its a little late for this info but i spoke with a crane rep. and he sad that their rockers are not compatible with eddy heads and thats them most info i could get out of him. so i bought a set of comp roller tips and they work fine, all nice and lined up.