Need help, What Cam Size?

[Isma98Z28SC]

Hello:

I own a 1998 Z28 with the 9psi Vortech with intercooler. My next mod is port heads to achieve at least 280fm, also I want to change the Cam and accesories. What do you suggest me?

Thanks in advance.

I live in Mexico City at 8,000 f over the sea level.

Ismael