Looking for a manual valve body for A-518 non lockup trans

I called SMR. They said they sell a 727 reverse manual valve body that's been modified to work in an A-518. It's $775 with no core charge. Also they said it will take three to four months for delivery from time of order to get it. Have you guys bought products from them? I don't want to send that kind of money without knowing anything about them.