Transmission?

[Handmedown]

I Have rebuilt my 72 350 with some mild performance built in. The transmission was rebuilt and only has a few thousand miles on it. Here is the kicker the transmission was rebuilt ten years ago, just a few months before the truck quit running and was garaged. So it has been sitting all that time. I am sure the converter is same as stock I dont remember. So my question is what should I do to the tranny to get it ready for my nice new motor, should I use a different converter? Thanks