s&s won't sell you the system for the morgan 3 wheeler motor as morgan is the only customer of theirs that uses that specific motor. Morgan is and has been working directly with them on the power upgrades for the last year or so and the system is an extensive one that will be used for the 128" upgrade as it's more than swapping out the cylinder and pistons.
i think the price list that leaked months ago was premature and not final so i'd hold off on judgment until it's made official and actually offered as it currently isn't. it will be soon so just wait a bit. probably by end of year.
mark reeves has been punishing a 128" test mule for almost a year now with the centra and other upgrades and hasn't had any issues regarding the larger displacement. I was lucky to be able to sneak a ride in the test mule back in january and i must say it was the most frightening experience i've had in a long time. the car is an absolute animal. will be overkill for most owners but for those who are looking for something truly bonkers the 128" is it.
Just be patient and wait for the proper release of the upgrade as it's all too premature currently.
Blake