Just to fly the Union Jack a little, Ray Monks’ Veterano is a very good model, NFFS Model of the Year in about 1973/74, I think. Anyway, it’s an all-sheet model, but construction is fairly straight forward.
The Night Train which was NFFS Model of the Year a few years before was also used by many with Rossi engines.
I have all the Free Flight News published in the 60’s and 70’s and there are a number of models in there that would fit the bill. Speaking personally I would go for a model with wing area on the high side (closer to 500 sq ins) to encourage a better glide.