rocker arm advice
Big Block Valve Train Assembly
With a stock type Hydraulic Camshaft {.450" to .475" Lift}
I use 'adjustable' Push Rods and {-.0005"} undersized Lifters.
It makes for a 'great' combination.
The 'stock' Big-Block Stamped Steel Rocker Arms {.140" side-wall}
and {.105"} at Valve-Tip and Push-Rod end should be fine up to 5500 RPM's
with Single-Coil w/Damper Valve Springs.
Note; A little old-school trick. Add in some 'Marvel Mystery Oil' with your Engine Oil.