Type 4 Questions

[GUTTERS]

CAN ANY ONE HELP ME WITH THESE FEW QUESTIONS.
1.
MY T4 HAS HYDRAULIC TAPPETS FITTED AS STANDARD CAN THESE BE CHANGED FOR SOLID LIFTERS WHEN I REBUILD WITH A LUMPPIER STICK.

2.
WHAT CAM WHEEL/GEAR SHOULD I USE WHEN I REBUILD IT.

3.
CAN I FIT DOUBLE THRUST BEARINGS ON THE CAM SHAFT LIKE YOU CAN ON A TYPE ONE CASE.

4.
HAS THE TYPE 4 CASE HAVE TWO OIL PRESSURE RELIEF VALVES LIKE A LATE TYPE 1 OR JUST ONE SINGLE VALVE.