Doh! I *finally* found the instructions for installing my oil tank (that's the problem with buying parts for a project over a span of years). The tank kit came with everything needed -- including this 90 degree threaded angle piece which, golly gee whiz, screws right into the oil cooler after tapping the cooler to "NPT 3/4-14"
To the tool store!
Thanks to everyone for the help!
Scott
PS: In looking through all of the past postings on conversions that others have done, it would seem that power is addictive . . . (2.0 to 2.7 to 3.0 to 3.2 to . . .) I can hardly wait for the 2.7 to require rebuilding so I can upgrade!