No I tried to search for it with no luck, best of my memory it was back in the summer, my and Gundy's buddy Alan was building his 1380, which I had help him with on some component work Anyway Alan wa doing final assembly and had the presence of mind to check lift at the valves, and was astonished at the loss of valve lift he was seeing, sent me a picture showing the rocker arm angle, it going up hill to valve. I told him Sean Brown had just did a study on MGB roller rocker arms, and them having too low of shaft height, and needing shimming at the pedestal to gain back lift, I suggested Alan find some flat washers that all measured the same, somewhere around .125", then put one under each of the rocker pedestals, retorque th head and check the lift again, he called me back and reported to me he had gotten back.030" of his lift, I also then posted his new picutre here with the washers in place, and just looking at it you could see the rocker arm geomentry had greatly improved, I suggested to him, perfecting the pushrod length, or even more shimming might result in yet more, but at that point he was satisfied with his findings. he then ordered some .125" precision ground steel and made himself a set of rocker pedestal shims, later I found out David Anton at APT offered them for sale, and since have stumbled across some in some of the spares I aquired over the years.
In the most simple of terms, most all roller rocker arms offered for our cars are designed at a stock shaft center height, but almost always the roller rocker arm is bigger in size than a stock rocker arm, so they tend take up more space and to go up hill to the valve tip, and this can be corrected by shimming the pedestal.
Theorectical lift, meaning cam lift x rocker arm ratio - valve lash, is just that, theorectical, you'll never get it in most cases, you may get close, but a rocker arm moves in arc, and as we ask it to move more (further downward) in that arc with higher lift cams the rocker ratio will decrease. David Anton and I have talked about this alot, he told me as delivered, that the Keith Dodds 1.5 forged non roller rocker arms come closer to actual advertised ratio than anything he has tested, but the good news is if you want roller rocker arms you can get back your lost lift with pedestal shims, and the Titan bushed shaft 1.5 ratio roller assembly are a good buy for the money.