The KB blocks are a reality--Call Todd Marsh at 336 283 0800 and get one--John Arruza has several iron blocks new but he is nuts at $6K a pop
He sold out everything machine shop and all but has these blocks as you might imagine due to the stiff price BUT he has the only ones on the planet so maybe he is just smart who knows
Indy--get a block then spend $1500 or more getting it ready to build --not such a good deal compared to the KB