If your pistons are below the decks you can use a thinner head gasket to make more compression, I would shoot for a minimum of .035 piston to head clearances at the highest point on the highest piston edge .040 is safer though
On the rocker arms I like and use the Harland Sharp 1.6 ratio for all my 440 type heads with the single shaft rocker arm set up. They can and will make them in any ratio you want also at 440-238-3260
The big thing that matters is on any roller cam is having the correct spring pressures, call the cam company and get the pressures they want you to use