With the ZZP kit, there is no need to change the heads.

With a top end swap, I believe it is best to use stock heads and stock head gasket thickness. Since the compression is already higher, you can't really increase it any more without taking a big chance of causing serious problems with your motor.

x2, the LIM has to be grinded in order for the injectors to go into it, unlike the Top-swap, which uses GTP heads.

ok cause im looking at the ass kit from zzp and i was just woundering on the heads but you think the heads that i got now are fine and a 4.0 pulley is ok for now.. is the ss intercooler good to do now as well?

if you dont have an intake/exhaust work done i wouldnt recommend anything smaller than the 4.2. Even then, i would strongly suggest doing some of these mods before the M90 should be installed.

edit: yes, now would be the time to do the intercooler

well im looking at doing a cai and i was wondering would the tog headers and 3 RT dp be perfect

that would be perfect. with that you could run a 3.8 or maybe smaller, depending on the tune

ok what should be done to the heads anything? will the ass kit from zzp work for boost?

the heads dont move. they stay on the car. of course the SS kit will work for boost...thats what it is made for

should i replace the rockers or springs?

if you want? if you do 1.9's you have to do springs and retainers. i reccomend 105# springs and LS1 retainers. but they are no fun to do while on the car

so what type of gain will i get with the ass kit 3.8 pulley, gtp injectors, intercooler and the tog 3 dp?

FUN!

I think you should do more reading before jumping into this. You seem sort of uncertain about alot of the info and you really need to understand everything that's required before doing this. It's hard to just say "yeah, I'm gonna do the SS intercooler", because it's not that easy, the IC install will take a solid weekend, and even though it's shown to be a bolt on and go solution, it's still harder than you would think. The SS kit is designed to convert your car to a GTP of sorts, and it will make about 5 PSI out of the box.

The kit, once installed, will require tuning (especially if running GTP injectors and TB) for proper A/F and such. Just keep reading up on it and asking good questions like you have been but you definitely need to be ready for a BIG undertaking, especially if you're doing the IC. It's no small job.

ok i guess im a lil confused is there better injectors then the gtp? if using the ss intercooler should i go with the north*? or should i just go with the ss m90 kit for now and keep working on other mods?

look. it all comes down to money.

Yes GTP injectors are better.
If you have the money for an I/C, do it. If you have the money for a N*, do it. I cant afford either one, so i didnt do it, but if you have the S/C and TB and LIM out of the car, then why not do all of these crazy mods. But before you can even think about the I/C-North*, you need some exhaust work, tuning, Intake, etc.