i'm not being funny Hav,
But people keep feeding you b-llsh-t, and as you dont know any better, you believe them.
if you brought the car to me as i said, i could of gave you a honest stat of play of the engine that was built for you. As i dont believe in slating people if they done a honest job, as its their Lively hood.
But 3 hours is long enough to remove, check, and refit, re time the cam, and set the static timin.