Looking at this safety drive shaft loop from carusoperformance. It's direct bolt on to the transmission cross member, noting to drill or weld. Here is the web site. Just scroll down and you should see it.
loop
Jim L
Lake City
Mitch D. River Falls, WI
Lifetime member of the "Cars apart Club"
1966 Chevelle SS 396 M20
1970 Chevelle SS 396 M20
1967 Camaro SS/RS 350 M20