[TurboKraft]

Here:

TurboKraft Inc : CIS Injector Blocks [930 110 141 TK] - $495.00
Gaskets and injector crush washers included.

Installed:
TurboKraft CIS Injector Block Set

The insulators are necessary so the cylinder heads' heat does not transfer to the blocks.

Unlike the stock blocks that warp and crack if you look at them wrong, these will last pretty much forever.