You are aware that the cam you have listed has the old 302 firing order in it, right? Any comp cam with the prefix #31 has this firing order. Just in case, the old firing order is 1-5-4-2-6-3-7-8. The H.O. firing order is 1-3-7-2-6-5-4-8. Any comp cam with the prefix #35 has this firing order.
Your cam
I don't think you will have trouble with clearance. What size valves? 2.02/1.60?