300H heads

["Mark Souders" <souders@xxxx>]

Hi gang,
My resto was going well until Saturday when I started the engine for 
the first time since its rebuild. When I put water in the radiator 
before starting it, I noticed a few drops of water dripping from the 
joint in the exhaust pipe. Didn't think too much of it until I fired 
up the engine and a lot of water and steam came out the tailpipe. 
The good news is the engine ran, the bad news is the left head is 
cracked. The engine builder told the guy I bought the car from that 
he magnafluxed the block and heads, apparently not.
I'm looking in Govier's Casting Numbers booklet and there are two 
different casting numbers listed but they both have the same part 
number. There is also a separate listing for the 300H, but the 
casting number and part number is the same as the line above it. 
What is the difference, if any, between the casting numbers? One 
little oddity is that the casting number on the head looks like 
2208324, but the number in the book is 2206324. This head is from a 
62 Imperial. The book says the casting for the 300H should be 
2206924.
Now I need to track down a good head to replace the broken one. I 
guess the car won't be ready for the May shows.
Another thing I noticed is on the Felpro head gasket. There are two 
small water return holes in the block and head that are not in the 
gasket. Is this normal? should I punch holes in the gasket to allow 
the water to flow? 

Your help would be appreciated,
Mark Souders