AU Firing order... trickflow cam

[bluestripes]

hi guys - need a bit of help.

I ve installed a trickflow cam with the following firing order 1-3-7-2-6-5-4-8

Its seems like a really silly question - but how do i get the to work with my twin coil pac?

Currently i have my leads connected to like diagram below, example position number 1 on the coil pac is connected to cylinder 1. 6 on coil pac is connected to #6 cylinder.

Basic problem with my engine is low vacuum. Mechanic suggest i try the 'other' firing order.

Basically i have 2 firing orders.

5.0 1-5-4-2-6-3-7-8
5.0 HO 1-3-7-2-6-5-4-8