this is my second engine swap from the original 5.7 TBI it came with in 91 - currently being pulled out 358ci SBC

I just picked up a LQ4 6.0 with 70k miles on it - I have a built 700R4 with 3500 stall and I'm stuck deciding to just cam it or change/upgrade the heads/intake?? If I stay with the 317 heads I know I'll need to upgrade the pushrods and springs (suggestions???) been talking to comp cams about a 228/234 .627/.602 112 - I'm interested in a choppy idle with strong power thru 6000+rpm

should I mill my heads and get a thin gasket to up compression or spend the money to swap out to a 799/243? If I swap do I need a new intake?

I'm also having trouble finding headers - there are a lot of LS swap headers for 2WD OBS but I'm not finding any for 4WD - mechanic doing the swap said to get a shorty or mid length and he can make the bends the rest of the way..

lastly should I keep my stock injectors or go to the 8.1L injectors?