Update on this deal. We received the B3 Racing Engines spacer kit and everything looks right on. I was getting the best sweep pattern with a .090 shim pack previously however the rocker was running off of the exhaust side of the valve. All of those things have been corrected and the sweep pattern is centered and not more than .045" mocking it up with a light checking spring. Needless to say I'm a happy gearhead. 2.00" installed height no longer creates rocker to retainer clearance issues, cast valve covers fit (header clearance) and I found long enough studs for full thread engagement on all five hold downs.