IMM Engines 408 build

Well I got the engine running yesterday but it is running like crap.:(
Have to take it somewhere ... hook it to a scanner... and have the injectors sycned to the cam. The tuner guy said I need it set at "Fuel sync (+8 to +10)"
He's going to tune it for me but all I have ever heard of was maybe +4 and for stock applications it is always set at 0. I will do what he says since he has tuned a bunch of engines.