Hi, yes the head gaskets are still avaliable, however they are listed on behalf of a college, if you pm me your number I’ll give you the contact number so you can deal direct. I’m having a lot of trouble with my emails so numbers would be better. When I’ve wanted piston rings I’ve obtained over size ones from Chester and ground them down to suit. I did have a couple of good bottom ends but after getting constantly messed about by idiots on ebay I sent a lot of items like that to scrap, a great shame but I lost my storage shed and even offering them for less than scrap I was constantly messed about. Scored pistons are often a sign of dirt ingress, however with these old engines it needent be terminal, I’ve had them looking like ploughed fields and the rings pinched into the groves yet they still start and run very well,the rpm is so low nothing has to be perfect, simply rub the high spots down with emery paper, if you can hone the barrel and you may be surprised. Don’t forget these engines had a tapered bore, it’s quite a bit bigger at the bottom than the top. The other thing that you’re almost guaranteed to find is a lot of valve guide wear, again unless it’s really bad don’t worry. Grind the valves in, get the timing right and just a bit of compression then they will run.