276 stroker from 35 years of parts

[GB SISSON]

Well, my T-5 is ready to install so my attention turns to assembly of the 8ba. I have decided on the 8rt camshaft. Les, the machinest told me he likes the ford valves and since I have so dang many of them, I should use all exhaust valves. I set up a mic as a go-no go gauge and got what I needed. I still didn't have enough of the hat shaped cup for the bottom of the spring for 'rotator' style assemblies. I have way more than enough of the cones that hold the keepers in.
Yesterday I noticed an 8ba block with the valves still in. I could make out the cone shaped piece through the ink black sludge, identifying this as a rotator set up. I pulled two assemblies out and found the 'hat' piece was different than what I'd been collecting, but the cone was the same. The first hat pieces are much taller and heavier, and I needed 8 more of them. Using the thinner/shorter hats I have an abundance of those. Is this thinner/lighter version acceptable and not just something a PO put together? I see the thick, deep ones in Ron's 'Nostalgia' book as refered to late'52-'53 style. Here are the two styles of 'Hat and Cone' rotator keepers I have uncovered so far, and of course this new 'mother lode' of assemblies will allow me to further hi-grade my valve train. Also note that the 'derby hat' style on the left and the 'stovepipe hat' on the right result in about the same installed spring height, but I haven't done a precise measurement yet.