I guess I shoud have done a little more research before I posted. I just read a half dozen good articles on the web about the use of SB2 and SB2.2 heads for drag racing. It seems that there are a whole bunch of issues involved in making them work on a stock block, not the least of which are lifter bore angles and rocker geometry. Also there is a recommendation not to use the sb2 heads, because the valve and spark plug placement of the old
SB2 heads are different than than the newer sb2.2 heads.
The flow characteristics of the generation 2 heads are very much designed with the constant high rpm of a nascar engine in mind. It seems that for throttle stop type racing, the velocity ratings are a big handicap. They do Flow big numbers but the rpm has to be high and constant to make use of it and keep the velocity/flow ration in proper correlation.
Most of the articles tend to caution the user to understand that the hidden cost of trying to make them work can out way the benefits.

Well, more research needed before we get out the check book.