drilling steam holes in 350 heads

I am going to buy some iron vortec cylinderheads to put on my 400 small block , what is the right way to drill the steam holes ?

All in all this is a job that is very cheap at a machine shop and probably should be left up to them to perform just because of lack of knowledge but heres the instructions anyway.

Place the cylinder head with the combustion chamber facing up with the intake face away from you. Place a 400 gasket over the deck surface and carefully mark the six holes with a starting punch. The holes on the exhaust side should be drilled straight into the head. The holes on the intake side must be drilled at a 30 degree angle toward the exhaust side. You can use a protractor from wal-mart to help with the 30 angle. The center holes should be 7/16 and the outboard holes should be 3/16.

Thank you Ray

It's only about $30 to have a shop do them. Why take a chance?

Has any one on the list put a 350 crank in a 400 small block ?
What do you think of this combination ?
Is it better than going with a 400 crank ?
I want to use the motor for street use , pump gas , and millage
Ron