Hi Jeff,
       The best way to match the exhaust port is to
get the headers first. Two sets of headers from the 
same manufacturer can vary.
If they aren't exactly a match to the 
gasket, I cut out a cardboard template ( poster board from 
Walmart and a ball peen hammer works very well here ) 
and transfer this to the head. I like to keep the exhaust 
port just slightly smaller than the header so there's 
never a problem with interference of the exhaust flow.
I built my own headers, and had to match the head to it
this way.
                                           Greg
'72 MGB GT Buick project
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