Bought his header. Works awesome. Bolts right up to the engine. Had to buy some bolts and a gasket for the bottom connection to the rest of the exhaust, but that's to be expected with a custom part.
Had my shipment held by customs, contacted gary and was pleasantly surprised by his quick response saying that it happens to about 1 in 20 of his US buyers.
Like many people already said in the forum, this guy is legit and I would easily recommend him to anyone and deal with him again.