[Fot] Valve seat crack

[Brian]

I have a GT6 head with a cracked valve seat between the intake and exhaust seats. Would it be worthwhile to magnaflux to determine how deep it goes into the port then pending the depth install new seats. This is on an older race head that is already ported. I do my own porting and last time took me about 80 hours to do. So since I live in the real world with a regular day job I am exploring options including time and money. If i can repair this head at a reasonable cost then I would only need to clean up the port work to match my current engine specs. Any input appreciated.
Thanks, 
Brian
Foster, RI
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