95 trans am help, 95 vs 95 power and whats a trans performance button around...

...the shifter for? (first off what motor does it come with, i know its the 5.7, and what is the button that's says trans performance?) i am getting an trans am convertible all it needs is some tires and the body has a little ding in it but overall the paint and interior is in good shape for $1000 but someone told me that they are a lot slower than the 96 models up, i think the guy is just mad because i come across good deals and he don't