Haven?t read all the posts so probs repeating someone but know that the lifters can make noise if:
- The wrong oil is used.
- The oil level is wrong.
- The hydraulic lifters need sorting.
To bleed the system just get the engine up to operating temperature, then hold the revs at 3000rpm for 3 mins. Repeat up to 10 times until the ticking goes. If the Bois persists and you have the correct oil and level, get help ;)