What about considering Tool steel lifters or Composite lifters from SM Machine LLC, KC fitted Schubeck composite lifters to my engine, it has done breakin etc with two dyno runs and the camshaft is run in nicely, Composite lifters are so hard they just glide easier over the lobe and dont need the complicated break in process even though KC removed the inner springs with my engine. The only thing to be wary of is valve bounce which can cause the lifters to fail, so I would look at valve springs every 3-4 years pending usage!
Delo 400 is designed for fleet vehicles diesel and petrol has 0.15ppm of
zinc etc which is good for scuffing parts etc like camshafts. KC ran my engine in with Castrol GTX 15/40 plus the engine had plenty of moly assembly lube going by the
oil left in the
oil pan!