Actually, when NHRA paid attention to blocks used, it was the "factory teams" that suffered, A. Johnsn was using a different block made by a other supplier totally by aftermarket. The problem with the denied block was that it actually came from the same line as GM "factory" PS blocks. In a typical pro stock engine you just don't go to a speed shop and buy a block, it takes A LOT of effort and changes to build one for use. Currently the mopar block is told to be about the "readiest" block on market.
Personally I have not seen anyt Eicke stuff. When they went with the 4.9" bore space, everything used "GM blocks", All the stuff I have seen is B1/TS parts for those. I believe there wasnt much performance difference at that point, but Eicke that co-operated with Steve Schmidt already had a working PS program with the GM, and there was kind of a temptation.... Hasn't been much talk about Eicke lately, was kind of beried with the mopar deal but was a main player before that.
I can have my hands on a pretty late B1/TS engine (Steve Schmidt/Billy Stepp), good power, but pretty "thin" comapred to csame era GM's, narrower powerband.
And you need a guy from Finland to write this.