4 degrees off

If the crank gear has more than 1 keyway it's there to adjust the cam timing. If it's a crank gear with 3 keyways there's 4 retard, zero, and 4 advance. Use the 4 advance and you should be ok. If for some odd reason it doesn't come out ok you need a 2 degree advance key, not a 4 degree advance key. Reason being the cam rotates half the speed of the crankshaft (that's why the crank gear has 1/2 teeth the cam gear has) so a 2 degree movement of the cam equals a 4 degree move at the crank.