what parts to get for a 318??

What I would do IF the engine needed a total rebuild;
(Or that's the route being taken anyway.)

Clean cylinder bores up or bore it .030 with torque plate.
KB Hyper-U's installed at zero deck height.
Comps XE 268 cam - (Only since you mentioned them.)
Bowl ported iron heads, 202's or Edelbrock heads
Roller rockers (Hughes)
tti headers into a 2-1/2 exhaust with X pipe
RPM-AG intake with a 650 carb