I can tell you my 261 ran like crap with a dwell of 34, sweet spot at 30, my experience only.
Excessive dwell closes the points too soon after opening, cutting off the magnetic field collapse before it delivers all its energy. I would imagine strength of the coil comes into play too here.

Last edited by sstock; 08/29/2019 9:34 PM.
1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
In the DITY Gallery
Video of the 261 running

1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration