If you don't have a degreed balancer, get a timing tape put on it. They don't usually last to long, but long enough to get your timing dialed in. Make sure of your balancer dia. before buying one. Pretty cheap<$10.
That cam could use a bit more initial timing, say try 14* for test. Before you do, you need to find out what your total timing is(no vac. adv. connected).
Thats where the tape comes in. If your dist. has 24* and you use 14* initial
your total would be (24+14=38). Check it with the tape. 38* may be too much at WOT. You probably need to get a adv. limit kit for your dist. Has bushings that limit dist. adv. degrees. Say you limit dist. adv. to 20*. You could then use more initial to equal the same total timing. 36* is probably closer to what you need, but every engine is a little different. Have to listen for ping and read the plugs after its good and warmed up. Too much adv. will leave little black specs on the plug porcelain. Don't run it long! Ruin engine!
Search ignition timing on forum for more knowledgeable info.