Ticking noise, 383, can't locate the source

I feel like a Jonly Bonly from Boldly-go.

In my ppwk for the Comp cam, they recommend their roller rockers 1621-16, which are $700.
Everything else is the recommended Comp stuff from the ppwk I kept, just the rockers are stock.

Can I re-use the pushrods?

Any comments on these is appreciated:
COMP Cams Pro Magnum Shaft Mount Roller Rocker Arms 1621-16