The RL24 well was designed for 4-10hp short shaft with 6hp being ideal.
Basically, I measured all the new and old outboards etc and discovered that the new models are significantly larger than old models. Top mounted starters and large diameter props are the main issues.
The 5hp Mercury/marina/tohatsu short shaft is the only new outboard with forward and reverse that fits in the well and properly stows when retracted. The outboard can be specified with a high thrust prop and 4amp charger. I am assuming the modern 5hp with high thrust prop will be similar to the old 6-8hp.
The prospect of leaving the leg or part there of hanging below the hull is not my idea of good practice. Sailing performance will be effected and there is a greater risk of engine damage when drying out on a beach(sand is very harmfull to the outboard).
If you must go for a new 8hp, look at the Johnson 8hp, its quality combined with the forward shift makes it the best on the market by a big margin. The additional weight, side mounted tiller and height of the new outboards is also a concern. You may have to modify your tiller and well to fit either new engine in. I have noted how I measured the well. tiller and engines to figure this out in my earier post.