I had a Quadra 75M on my GP 330L for about 80 flights. Being the magneto version with fixed timing, it was heavier (almost 7 lbs!) and "shakier" than many other big singles, but didn't seem to do any damage to the airframe.

I've sold the Quadra to purchase a ZDZ-80 that I plan to use with a quiet can (in that big area begging for cans) now that I have experience with the ZDZ-80 in a H9 33% Sukhoi that I also own.

Once the ZDZ-80 has some time on it, and the low end is leaned properly, it's really pretty smooth.