In my motorbike riding days I had a BMW K100RS 16 valve, the standard shock was dreadful and in the end I got a French Fournales shock, this uses air over oil and seemed to work quite well, we have some awful road surfaces over here and at illegal speeds the back end bounce made riding uncomfortable, I could go for the fournales system on the Morgan but I did have to have a special high pressure pump which is the tough part as the shocks are hidden under a car but in your face on a bike. so pumping the things up could be difficult

The front on a Morgan can be a little underdamped, one section of road between L'Orient and Vannes in Brittany could make you seasick, even wife noticed the St Malverns dance, would the front not upset the rear?