Thanks guys for your replies...I have tried calling the shop that built the engine but they never answer the phone. I always have to contact them by email. I definitley wouldn't recommend them to anyone. On the other hand they have worked through the problems I've had on the engine and reimbursed me for the screwups.
My block is filled to the the bottom of the front freeze plugs. Supposedley this virtually eliminates bore flex and improves ring seal which equals Horsepower. It also gives an advantage with cooler temperatures since most of the heat generated in the engine occurs in the top half.
I have a book that talks about tapping the large water openings in the top of the block with 3/4 pipe plugs. You then install a steel pipe plug and the rest is cut off prior to block decking. After decking a 3/16 water hole is drilled into the center of each plug. I'm assuming this was done on a 350 chev though. The book doesnt state wich block it is except for SBC.