I'm building a '57 292 for a project and am installing a Comp cams camshaft in it. Spec are, gross lift both I&E .471      Duration @.015 tappet lift 261 Intake & 267 Exhaust      LSA 108* . My problem is this, when degreeing the cam I have to "retard" the cam 6*, my multi keyway timing gear set can be adjusted to 8* advance to 8* retarded so I,m not maxed out but 6* sounds a little far. What do you all think? I have checked and rechecked my process 3 times and it comes up the same. The cam card says I need a 108* intake center line. 
I did a on-line chat with Comp cams tech guy and he said it "sounds odd but strange things can happen with custom ground cams" & "just put it in and see how it runs" Someone on another site suggested checking the exhaust side to see if the cam was ground right and I guess I could figure out how to do that working off of the cam card but would I have to check each intake and exhaust lobe? Am I just over thinking? 

We(Ted and I) found the Comp Camshafts for the Y block were ground on the wrong lifter angle and when you advanced or retarded the camshaft, it was off on every lobe from the cam card.  Straight up was the only way it matched the cam card.  Had 3 Jones camshafts the same problem.  Howards, Jones, Comp all use the wrong lifter angle when grinding their camshafts.  ISKY uses the correct angle, and you can advance or retard the ISKY with confidence.   Just my experience, but I called Mike Jones, and he now has the right angles, and he reground me three camshafts for free.  They checked out when degreeing after the modification to correct valve angle.  Joe-JDC

JDC

So, if I check the valve timing for opening timing and find they are not matching what the cam card says I should try setting it up "straight up" and recheck opening time to see if it then matches the cam card?