Hey Stretch... I'm looking at doing that... My test Ring is still in my 65 'cuda and I'm "Liking It"...
To have a .250 thick & 5.100+ Diameter Billet Aluminum Ring... You can not have carpet on top of the Boot Ring... Have to cut carpet so it goes up and touches the outer side of Boot Ring... Else shifter shaft may make contact.. (shifter high... Ring low)
Also you need to have a very good tranny mount (not sagging)... Mine is a Schumacher polyurethane Tranny Mount.. holding the shifter high and ridged.... Having a sagging old tranny mount has caused a lot of those factory "shift road map plates " to be destroyed or broken".. my thought on that at least...
So far my Testing of T6061 Billet Aluminum Ring has been Good... And I have slammed gears Hard!!!! ⚓