One thing to check is the left front head bolt area around the water pump. If that bolt gets torque to tight, you can pull the corner of the block off. The water pump opening is very close to the bolt boss, so check for a coolant leak around the front and side of that corner.
All 230-292 heads will interchange,
http://inliners.org/ then off to the left is a list of sub categories, go to TECH TIPS, then LATE GM HEAD VOLUMES.
