I just bought 98" CP flattop pistons for my build and the best price I found was at http://www.campbellenterprises.com/
$300 shipped to Maine USA (Big Boyz).
You'll get a lot of good technical advice on this forum. Read a lot before spending anything.
I love the internet. What used to take me 144 beers to learn at the bar I can now learn with 1 beer. The great thing is I remember what I learned now.
98 inch, CP Pistons
BB Ported heads
Hydraulic Chain Tensioner
D & D FatCat
Power Commander IIIr
Lots of chrome