1998 z28 camaro from Mexico

[Tonokologo]

Hi, I have a 1998 z28 camaro, auto, im from Guadalajara, Jalisco (tequilas land) jeje
Mods that i have are:
1. 373 gears
2. cam 222/224 Comp cams and valve springs
3. headers
4. 3000 stall
5. PCM repro by RED
6. LCAs and Relocation brackets
7. Stock heads

And my car is running 1/4 13.5 13.6 here in Guadalajara...
Im very confused now because a have 2 options:
1. I recently bought a 243 stock heads and i donk now if I should ported them? or let them stock
2. A friend has a C6 6.0L motor stock and he says me that is a very simple swap.. i was reading a lot of posts but im still confused? about reculator wheel or cam arness (something like that) jeje
3. what would you do? put the 243 ported heads or get them back and swap for a stock 6.0L? i appreciate all your help...
here pics of my camaro

[Pony_Eater]

13.5 seems really slow for your mods....