No matter what you buy, do the geometry yourself. No, "use lash caps" is not technical advice, it's just what people say.
Get the pushrods afterward.
In terms of improved breathing: if you cam is too small (and it looks mild to me) 1.6 intake rockers will help, but 1.6 exhausts will do less.
If the cam is too big (certainly not yours) increased rocker ratio won't help you.
Needle rocker bearings allow you to restrict rocker oil delivery somewhat. If that's not important to you, you don't need them. I prefer bronze bushings.
1.6 rockers (vs. 1.5) also increase the spring load on the pushrod, adjuster, and tappet by 6.7%: with 500 lb. rated springs at full lift, the 1.5 rocker is 750 lb. on the tappet, a 1.6 rocker will be 800 lb. This is why rockers with 1:1 ratio were popular before WWII: the cams wouldn't take the pressure, all the lift had to be built into the lobe.