My Roadster with a Ford V6 basically stops accelerating.

The Roadster S1 has the ST220 engine in it. It is basically the wider chassis like the old +8 & the +4.

I think 4/4 are still narrower. Also Morgan made some mods.

GoMog has details
http://www.gomog.com/allmorgan/ROADSTER1stInformation2.html

I think the cyclone is the later engine.

I would have thought it would be easier to buy a Roadster.

JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"