Ex TBI, now carb 92 CSB. Next step?

I have a '92 police 350 engine who is rebuilt from TBI to carb.

It's a Air Gap type intake, Pertronix distributor and a 620 cfm Demon carb.

The mileage from the Caprice donor car is app 80.000.
It's not tested after the rebuild.
What will be the logical next step to get more power?

The rebuild from TBI to carb was done partly because my lack of knowledge on TBI systems and because the engine is to be placed in my 34 Ford hotrod.
In addition to that, the TBI system was far away from complete.

I've heard TBI engines have other cams than carb equipped engines.
Does anybody know the cam specs on my engine?
Should I change the cams?