Offenhauser 4bbl intake value

I've located a used offenhauser 4bbl intake for a /6. Guy was asking $200, but said he would take $150 for it with all the adapters. I have a few /6 engines laying around and may be using one in a build. So I was wondering if this is a good deal for it and if I do get it and use it, does it work with the stock exhaust or am I needing to upgrade that as well. I am assuming I could use fi tech with it as well.?.