I've seen some crummy components in Tomco kits. I've always had good luck with Standard/Hygrade/Sorensen rebuild kits - all 3 are from the same manufacturer. I'd use them on anything, except 4150/4160 Holleys - there are better makers for a holley, including holley. The last AVS kits I got some years ago came from Year One and they were OE Carter kits.