I have seen several people use FiTech with good results.
However, if you ever have a problem, customer service is knowledgable people but if you have a real problem and have to get parts or return for warranty, they truly suck.
My experience was so bad, I will use Holley now. Prices are just a little more, but the service, if you need it, is soooooo much better.
They make tank conversion kits and a small tank that goes under the hood that works great and is easy.