Cam and V/C questions...

Let my start by telling ya'll what I have. I bought my 97 GT last sept. I know the previous owner did some tranny work, shift kit (j-mod ), cooler, not sure about to T/C, weld-in flowmasters.
I got the rear-end rebuilt first, full rebuild with 4.10's of course. Then I added a o/r h-pipe.

Now for the questions- Are all aftermarket cams stamped?
And which valve cover is the easiest to remove/install?

What got me wondering about the cams is, a friend of mine got a 98 GT auto a couple weeks ago. Its mostly stock with weld-in flowmaster and 3.73's and a K&N. And his car doesnt sound or run anything like mine.
So it got me thinking that maybe the previous owner did more than I thought. I know it doesnt have the PI swap done, still has the new version NPI intake on.

Thanks
Keith

Im sure its a NPI intake, just has the upgrade aluminum cross over.
No pullies, as for the tune Im not sure of. I checked the ECM for a chip, which it doesnt have. But it could have been tuned, the car was a repo when I got it.

Bump