The circled pushrod in the pic is original equipment. The tubular ones in the photo are replacements. Either one will work as long as they're the right length. Pushrods can be straightened, using a small arbor press and a dial indicator. Use a set of V blocks to support the pushrod, find the high spot with the indicator as you rotate it, and use the press to straighten it. I roll pushrods across a piece of plate glass cut to a length that allows the bulged ends to hang off the sides to check for high spots. Use a bright light to back-light the rod as you roll it across the glass.
The holes in the rocker shafts should point down. Later model rockers intended to be used with pressurized rocker shafts have lubrication grooves offset from the lube holes to prevent oil from squirting out of the rocker weep holes.
Jerry
