If its stock 460 the 425/model E would be a good setup if its "souped up" go with the twin 425 and at least one Model E

If you are going straight LP 28-32 degrees total advance with about 18 initial. If dual fuel you are going to half to wing it. Snice dual curve doesnt exist anymore and if you set it for lp it will be over advnced for gasoline. You can play with this to see what works best for you.

Regards