Bill,
The MGA seems to take corners much more effortlessly than the Sunbeam. You really want to take corners withouty slowing down. I'm not trying to be critical of the Sunbeam. As I said, I love my car and having it makes me happy.
There is a fairly windy road between Montral and Hudson, where you really can't get up much speed, and I think that I would rather drive that road in my MGA.
But there are other roads up north with longer turns, where there is no need to drop below 50, and the Sunbeam is ideal for those roads.
That being said, I hate taking the MGA on the highway. And the Sunbeam cruises much more easily at any speed I choose. It's a much more solid car.
By the way, I remember when I raced my Tiger years ago at St. Jovite. And stock MGB's really gave me a run. The Tiger was no competition in the corners. But the straights allowed me to get ahead. But my lap time were only slightly better than thre B's. Maybe 2-4 seconds. And then there were the Cooper's.... Wow!
I remember being about 1/3 up the back straight and seeing a cooper behind me, just coming out of the hairpin. I thought I'd never see him again, then about 2/3 of the way up the straight. Bzzzzzzzzz. And he was gone.
One thing I will do next summer is use spacers on the the back wheels, and get slightly wider tires. I have the 155's now. I think 175's will be an improvement for the power I have.
Mike