Am I crazy?

I got a '68 Dart with front brakes from a '73 Duster for a bbp conversion, was going to drop in the old master cylinder and booster because previous owner claimed that they worked, but seeing the mess I made removing my old parts, I decided against dropping it all in without rebuilding or replacing them, I found this complete kit (minus bracket)

https://www.oreillyauto.com/detail/...factured/506101/4566295/1973/dodge/dart?pos=1

at that price it almost seems too good to be true. Has anyone else tried one of these?
I've heard good things about booster dewey located in portland but I think they only do boosters and I would like to get the MC and booster replaced together
Thank you in advance