G-Bar questions

[Mikamaro]

In the quest for fat rear meats, I would like to install minitubs and a G-bar on my '68 Camaro. I have some questions for those of you in the know on the G-bar setups...

1) Any .pdf install guide available?
2) Do I still need the DSE shock crossmember (for structural integrity) if I have the G-bar shock crossmember?
3) To fit 335/345's do I need to cut and relocate spring perches on the axle?
4) Will my housing have to be realigned/straightened?
5) 3" exhaust out the back? (already have Magnaflow 3" kit)

Regards,
Mike