Scottgbpack

I purchased a 2000 c5 corvette from a widow very inexpensively because the car is a bit of a mystery. It runs great and seems to have been professionally built. I'd like to tune it but not exactly sure what I have. I took a chance because the price was right. From the spark plugs and the perceived hp it seems to be a 402 stroker with a moderately aggressive cam. Shirt of pulling the motor and disassembling it, what's the best way to reverse engineer the build to get a better tune in it.

Thanks,
Scott