Looking at his combo he is running a cam that is 1/2 step larger than yours. That's minor, IMHO maybe 10 hp in your engine. The major difference between you two is HEADERS. I mean, shoot he's running less gear in a car that weighs the same maybe even more.

Feeling more power is actually feeling the effects of torque. Something long tube headers do is increase torque below the torque peak.

I do not see a cam change as being beneficial to you unless you go radical on axle ratio and converter.

Torque with exhaust manifolds is increased by increasing either compression ratio or displacement.

One last thing, ignition curves can really affect the way a car feels on acceleration. This is where I'd start.

R.