360 974 heads which roller rockers fit?

hello i have two 974 360 heads with stainless steel valves 2,02 and 1,60.

the heads have been ported and someone has milled down the mounts to the rocker arms on the heads, why does anyone do that?

anyone have a solution to what I can use for rockers??
I think the guy I bought the heads of said they was chevy valves in them

pic