Hello, I bought my first Morgan late last year, a 22 Plus Four, which I also found pretty draughty, particularly through that same gap between the top of the sidescreen and the hood. I've solved the problem in a rather vulgar fashion with 1 metre of 10mm round neoprene from ebay which I folded into about a third of its original length, taped it into a sausage shape and then simply stuffed it into the gap in the hood where it stays hidden until I raise the roof in spring. I've done both sides the same and so far it's served me well and although it's as low tech as you can get it does seem in keeping with the rest of the car. I've also glued the same neoprene to seal the gap between the door and bodywork and it's now far more comfortable than when I first brought it home.