[1968k10blue]

I have a 68 hence the username, which has a 350 ci engine out of a 73 chevy truck and it has a weiand intake, 600cfm holley carb, aftermarket headers, and an hei conversion. all of this was done before I bought this truck and I was wondering what are the chances it has an upgraded cam? it seems to run smooth, so if it does it's no mother thumper or anything, so I was wondering if there were any other way to tell besides pulling the engine apart? Thanks in advance!