The blocks on mod motors are pretty robust. However, since your spending that much time on the top end, if it was mine, I would have the block magnafluxed, decked & blueprinted. At the same time I would beef up the rotating assembly with a Terminator forged crank, forged H-beam rods and new slugs (pistons). All of these components should be balanced an blueprinted. Update your oil pan, pump and pick up. Use ARP studs to secure the heads to the block along with high quality MLS gaskets.
Post some pics when you can and good luck!