In the early 70s a few v8 Healys would run with the big bore sports racers, McLarens, Genies, etc, but were not competitive .Really mean looking though. Most ran with halibrand mags and bicycle rear flairs like the corvette grandsport.
They were so twitchy under power off the corners that our A and B production corvettes would pull away, but on a mile straight they would almost catch back up.
I never raced a V8 Healy, but on track with them they appeared to be a handful at any speed.