87 T/A 305 TPI....
What's the best performance chip to buy and where is a good place to get it?

Go:

https://www.thirdgen.org/techbb2/sho...hreadid=104792

If your car is stock or it has mild mods go with a jet chip.If you have heavey mods then you need a custom made one.

The best would be custom ones like mine. Try to go on the regional board that is your area and ask if anybody does custom chips. Mine was done by the moderator Kevin who is about a 30 min drive from me. If not then I think JET makes a good one.

Try and learn how to do one yourself. You dont want to get ripped off.