Have have limited street/strip experience with TR-1 10W40 racing oil in my big block chev - limited because I haven't rebuilt this combination yet - but the engine builder I used for this combination did NOT want me to use any other oil - and showed me the bearings / lifters / valves / cylinder bores out of the other competition engines in his shop in support of his recommendation.
I did my own research (including some done on this website) and phone interviewed other builders with experience in these types of combinations - the ones that did use Torco absolutely recommended it - the ones that didn't use it did not have reason to go to a smaller distributor for oiling problems that they didn't have.
I have 5 gal pails of the TR1 10W40, and their full synthetic gear oil being transported up here for the next big event (Canada), plus some of the oil additive to play with on my lawn mower (first), and van (distant second).
That's all the info I have - other than the valvetrain looks pristine in the motor I'm using it in - it feels slick between your fingers like something around a 30wt castor oil - has an "odd" smell - and cleans tools really well when trying to wipe the film of it off - oh - and hard to wash off your hands, plus makes it hard to hold on to tools when on your hands.
MAT