.050" Standard width probably, but that is not for performance width.

It will work fine, just not as good as a performance valve job could have, & I am not talking a couple CFM difference in a standard plain valve job compared to a performance valve job.

All these little items, seat width, proper angles, throat angles etc, can all add up to a whole bunch more CFM.
Probably not too critical for what you are doing with this engine I think.

My prediction still stands, you have 2 days to get it running. ;\)
Good luck!

MBHD
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12 port SDS EFI