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your best bet for performance parts would be on a MEL forum or off ebay maybe.
do a google search for MEL or Lincoln sites and see what they offer.
just remember the 462 can't use some of the performance parts designed for the other MEL engines. although from the same engine family, they are not all the same.
te 430 engine was a popular upgrade engine in the early 60's Thunderbirds, so there are probably a few performance parts available for that engine that might fit the 462.