4 link and Pinion Angle Question

[67rstbkt]

OK, so I've read and read, and searched, followed by more reading on the subject of pinion/drivetrain angle and I'm just confused by it all at this point. I've got a ridetech 4 link with their coil-overs going into my 67 Firebird. In my Pro-touring book, it seems that the best way to set this up is with engine/transmission pointed down about 3* and rearend pinion down about 3*. I've also read that many prefer down on the engine/transmission around 3-5* and up 3-5* on the rear.

Which is it? I know on the factory setup, my stock rear end was about 3-4* up.

As of this moment, when I set my transmission and x-member in, I pointed that down in the 3-4* range (I'll have to check the exact as it's been awhile since I did that)
Currently, my leaf spring perches are set so that the Ford 9 I have is set up (as in higher) about 3-4*

Will this work ok? On the ridetech bars I have, the lowers are not adjustable, but the uppers are.

My setup is the Pontiac 400 with a manual transmission (T-56)



Any advice is greatly appreciated