Advance Keys

Differences in timing chain sets can also cause them to be off. A few yrs. ago I rounded up 4 timing chain sets and did a test on all of them and none degreed the exact same. The worst (a Mopar perf) was 3 degrees off from the best. Every time I've degreed a cam and a Cloyes set was used they were within 1 degree which is perfectly acceptable.

With the description you provided I'd run the cam as designed which is 106 installed center. A general rule of thumb is every 2 degrees you advance the cam you move the peak rpm torque down 200 rpm.