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No, you cannot machine out the metering block yourself.
It sounds like the previous owner swapped out the primary side metering block to one that does not use a power valve. Probably was only used for drag racing and it was easier to tune with just the jets. That's OK for a drag race only carb. But street operation without a power valve will suck big time!
Get the correct metering block and swap it out, and use a 65 PV like Jerry said and bring the jets back down to about 70 for initial starting point.
My strong suggestion is to also call Holley Tech.
Monday through Friday, 8AM to 5PM CST @ 270 781-9741.
They are very good and a lot of help. Have the carb in front of you when you call.
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Warren
'Liberals are maggots upon the life of this planet and need to get off at the next rotation.' (Jamo 2008)
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