No, that would be WAY too far down and that hangs people up sometimes. It's clear as a bell in the MP manual and people spout 5-7 down as gospel......and it is, sorta, but it's referring to 5-7 down FROM the angle of the drive shaft, not the transmission shaft. When I set one up from scratch, I set the perches on the rear housing with the pinion 5 degrees down. Normally, that gets it so close it usually doesn't need any shims if everything else is right.
Of course, there's always different applications, so it's all dependent on "WHAT" you're doing.