17059272 is a good core to start with and responds well to the mods laid out in Cliffs book.
Because it was intended for a 301, the secondary airvalve needs it stop ground down to provide the air valve to open farther (1.270?)to keep it from choking off your 461.
Also the 17059272 had a small hole cross drilled in the secondary fuel discharge nozzles.
These should be swapped out with solid ones.
A punch/round rod that fits snuggly inside a tweaked/wiggled will take them out easily.
Replace with solid and a dab of red loctite.
Only tap them back in far enough so yo dont block the verticle fuel passage.
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