OK, so you will need a PGA FPU that can run at 40MHz. And also looking at the picture it will also need a 40MHz Crystal Oscillator (14-pin DIL I think).

It might be worth sending a message to the forum member FOL (Chris) here as he actually works for Amigakit and can tell you exactly about what is needed to add the FPU to this card.

Amigakit don't have any 40MHz FPUs or Oscillators on their site at the moment though, so you could ask FOL if they have any, and if not one of the other 2 places I posted above should be able to help you.

And if you are going to be doing some programming then it might be fun to have an FPU to play around with some code using it.