The Lycoming 0-235 was far inferior to the RR/Continental 0-240 in my opinion.
I believe the 0-240 was developed by RR at their 'small engines' factory at Leavesden where they already license built the 0-200.
Fitting the 0-240 to to the F150 made it into a much better aircraft to fly with a much higher cruising speed etc; I hated the C152 with the Lycoming which I found was difficul to 'hot start' and not as lively as the Aerobat although the pre-set flaps were a good feature as sometimes in the 150, I found if you set the flap you wanted then released the switch, it could flick to the 'up' position without you noticing.