I want to upgrade my L98 engine. Here is what I want to do:

1. Re-manufacture my existing Stock L98 5.7L V8 350 TPI engine (245hp)
2. Upgrade cam to one that obviously Lopes however MUST be comparible with the specs of the car (below)
3. MUST not have a problem with passing Air Care (I've been told too large a cam will cause the engine to fail the HydroCarbon test on aircare or something).
4. Want to change piston heads
5. Same gas (I use 92 octane)
6. Adds more HP

[SPECS]

Engine: Stock L98 5.7L V8 350 TPI engine with K&N's
Tranny: Rebuilt 700R4 4-spd Auto tranny with overdrive. Heavy-duty Kevlar bands, new clutches, shift kit, new friction plates, new bushings)
Rear : Stock 3:23 gears (WANT to stay the same as I also drive on HWY).

MUST PASS AIR CAR

I only drive around 4,500km a year. Please, I would suggest your opinions and recommendations on mod's and experiences on the topic.. My LIMIT is $4,500CDN Final Total including tax, labor and parts.

How much HP would I expect possibly with the mod's? Thanks