My H/C question.

[Ryans99LS1]

My trans swap fell through because ive been screwed over 3 times already so im spending the money elsewhere. Ill be ordering my H/C package when i get back from vacation, if all goes well.

PRC 2.5 5.3l ported heads
Torquer v.2
ported oil pump
ls2 chain
comp 918s
hardened pushrods

My question is, i want to bump compression to 11 to 1. So what size head gaskets should i get? Also what size pushrods? Just to throw it out there, what do you think ill put down after its all installed? I was thinking about 420hp/400tq.

I also have an IAT high voltage code, does this mean that my car is pulling timing due to high IATs or this strictly electrical?