you don't need a teksid block to hold the power, you need the internals to handle the power. We don't have the problem that 5.0's have with blocks splitting in half with over 500hp. You can get a heavy iron block and as long as you put billet internals you can handle over 800hp.
your getting everything confused dude, a block is just a block, the internals ie. rods, crank, pistons, are what have trouble staying together with power. you can use your stock block, just the block, you know the cast iron thing with holes in for pistons and ****, for 2000hp if you want. Again its the internals.