what cam for this engine?

My x headed 340 has 9.5 comp , 155 psi cranking and dont detonate with 91 octane.

if i run less octane, i get specs on the plugs.
and thats with a 'to the lean side tune' 26* initial 34* total, no vac advance 750 holley and dual plane intake 3.73 gear and 4spd tran in a 3300lb car
but theres ur proof