Skidim does have the 4160 Holley carb kit. It is Rn0120-1, at least for the Holley on the 351. for $50. You can also buy gaskets for the metering block and fuel bowl separately from http://www.holley.com/0-80319-1.asp
, and maybe also from Skidim. Holley also has the complete carburetor and a kit, but I didn't check the price.