l98 heads. cam upgrade

I am from the Northern Territory and have next to no experience with Petrol cars besides servicing My cars is a 2008 WM Caprice with a stock L98 with what I believe is aftermarket LPG setup installed but decommissioned. I’m looking for some advice and guidance on upgrades specific to highway...

Hi all, I am having a new cam and OTR fitted to my VE SS Ute on monday, and have been tossing up the idea of replacing the cylinder heads at the same time, can anyone help with who supplies, price and the advantages of doing it. If there is minimal KW gain then is it really worth the money...