when i built mine,i drove it for about 20miles/half an hour giving it plenty of beans but never full boost (i think full boost was around 25psi at the time) with cheap shit oil

it never got full throttle but was driven fairly quickly,up to a max of around 100mph in fifth,probably a max of around 12psi on it's way there,and never going past 4500rpm, after this i changed the oil for some good fully synthetic and drove as normal,i.e hard

my own belief is that when an engine builder asks you to take it easy for 500-1000miles or whatever is due to the possibility of niggly problems arising,such as oil seals leaking,bolts coming loose etc etc and nothing to do with 'bedding' it in.

obviously if these niggly problems do occur,there's less chance f problem if you are taking it easy,and so they can be rectified easier.

unless you have had new cams or new block then the only thing that needs bedding is your piston rings

don't go too easy on a new engine,or you risk glazing the bores and having excessive oil consumption!!!

as a note my engine NEVER smoked hot cold,full boost or overrun and used next to no oil,using the method above.

but my advice is do what your engine builder says,or else he may invalidate any warranty he gives you