I'm in this posistion right now, and, decided to go with a new TA block. I'm going to use my 4340 3.400 crank, Eagle rods, GN1 heads, and anything else I can to keep the build down. I'm waiting on a quote from Nick as I'm leaning towards having him build it. Might end up having the machine work done in AZ and assemble it here, haven't really decided yet and the blocks wont be done until the end of April (hopefully) so I've got sometime to think about it. I chose to do the TA piece because to me it seems as if it's a much wiser investment at the end of the day. IMO the only reason an iron stage block would be the "desired" block is budget. Why wouldn't you chose the piece that's PROVEN to be able to handle MUCH more power safely AND can be repaired if need be MUCH easier as well?