Slant six cams do not have a snout. They are flat across the front with a threaded hole for the bolt and a dowel pin. The register in the cam sprocket should be the same diameter as the cam. Approx 2 inch dia. It sounds like you have the wrong cam sprocket.
This is what a slant six cam sprocket should look like. NOS Chrysler Slant 6 Chain And Cam Gear 2 Peice | eBay
Actual slant six cam pic. NOS 1970s' Mopar Slant 6 Camshaft / Cam - D956 | eBay