ef / nf V8 mods

[FGII-XR6]

I'm thinking of buying an NF Fairlane at a good price . as much as I love my XR6 I haven't had an 8 for a while and want one to play with ( I'm still keeping the XR as a daily driver)
I have limited experience with injected Windsors
what mods do you guys recommend cam is out of the question as I don't want to dump the AC gas, heads could be an option but probably looking for simpler stuff to start with. I know the stock EF / NF V8 are a bit asthmatic so I am thinking of exhaust / intake to start with.
A few questions

1. what is involved in fitting an AU intake setup ( complete from manifold to air box) I have heard you need to do some mods for the explorer manifold
2. I have looked at the Redback site and the have no Fairlane listings are the Fairlane exhausts the same as the wagon due to both being longer wheelbase?
3. I am looking at a cruiser with a nice note and good low down grunt not a top end screamer with this in mind what extractors would best suit this?
4. are J3 chips worth the effort? if so who would you recommend for this?
5. are the 1.72:1 roller rockers going to give much gain and will I need a taller rocker covers?

I'm sure to think of more but that's a good start , this won't be a daily driver more a weekend fun car and occasionally drive to work if I'm getting something done to the XR so consumption is not critical but don't want to tow a trailer to carry enough fuel to keep it going