I am betting bowl work, biggest valves, what ever gives you excellent flow numbers up to your max lift will be your best choice. A wide 110 lsa on a motor like yours sounds all wrong to me. Small heads, HUGE motor! Likes overlap. The question is how much overlap can be used and not screw up the manners down real low? Vizzards book on power has a chart that says a 540 with those heads could do best with a 100 degree LSA! But obviously it might have a pretty ratty idle. Some Harley cams have a similar situation, and aftermarket grinds can be had with 98 LSAs! Something to think about. Time to consider a REAL custom cam!