Is 6* advanced ok?

After degreeing the cam in my daughter's 318, we found it to be 2 * retarded. (109 vs 107 per cam card)
Fellow member 340Sixpack sent us a 4* offset cam keyway. For free I might add.

:thumrigh:

When we installed it and rechecked it, the cam is now 6* advanced (101 vs 107). Is this correct that it would change double? Or are we doing something wrong?

And, if correct, is 6* advanced okay?

It's a stock rebuild 68 318. The pistons are .050 in the hole and we have the thin Mr. Gasket head gaskets. If we calculated it correctly, compression should be 8.7 to 1. The cam is the small Summit cam, 204/214 duration, 420/442 lift. The engine is going into a 73 Duster, 904 & 3.21 gears. It'll be my daughter's daily driver.

We appreciate any input and/or suggestions.
Thanks,
Ken (& Heather)