[71cadc10]

correct, I have changed the rod bolts to ARP on these dozen times or so...I have not encountered a problem with out of round on the rods. I have checked bearing oil clearance before and after the rod bolt change.
The resizing procedure for these rods is to use an overside OD bearing, and you hone the rod bore bigger. Honestly it's not worth it in my opinion, I'd buy a set of H beams before I'd sink money into stock rods, other than the $100 ARP bolts


The main cap bolts, I typically re-use them. They are torque + angle to get them tight, they are not a torque-to-yield item so you can re-use them.

15# + 80* (inside bolts - do first)
15# + 53* (outside bolts - 2nd)
side bolts 18# (last)


for the oil bypass plug question, if you mean the one in the oil pan, yes I'd plug it. It's metric thread

for your pushrod issue, I'd suggest going with new hardened push rods anyway 5/16 or 3/8. New stock rocker set is ~$200 from Summit. I stay away from the 'trunnion kits' and just put new rockers in.
Don't know if this was covered...but the 317's are a good head...same port geometry as the 243. Just a larger chamber....A good valve job, check guides, mill gasket surface (you could whack up to .030 off if you want to reduce chamber). Cam choice will determine how much valve spring you will need