Here’s the one I use on my 312 from NAPA. The valley pan is stock containing the screw post for the RDT. I just inserted it deep enough to hold it, it’s not contacting the screw post the allowing engine vacuum to open and close it normally. I have at least 1000 miles on it and everything seems to be working fine wo excessive oil consumption.

1955 312 T-Bird Warwick, NY