Hughes Engines, If I remember correctly, provided the fasteners. They are 12 pt. hardened steel. Will check my receipts for possible alternate source but believe I'm correct. Came with a butt load of shims as well. Rocker Arms Unlimited bushed the 273 rocker arms. No torque specs provided. Just instructions to clean rocker shafts before assembly. Cleaning means the inside which was very contaminated. Regarding torque plate, Short block machining and assembly was done at machine shop. Doubt torque plate was used. Block deck was surfaced and bored .030 over with sleve in no.1 hole.