Tom ~
Once again you're Quite Right! In fact, Volvo was the only engine I ever saw in one of these, altho i know that Triumph, Rover, Chevy V8s, Ford Cobra V8s and BRM Repcos were stuffed into them over the years, pushing them to 185mph, with 0-60 in 4.1 sec, if you believe Wikkipedia.
I had thought they went out of business completely, but Wikki says they kept rising from their own ashes and were made into the 1990s. Maybe that's why Mike's photo didn't look familiar ~ it may have been a later year model than I was familiar with.
In the 1960s they were absolutely beautiful cars, but poorly finished.

Frank

A 1963 Marcos with the Volvo engine:

I think they were Triumph, (spitfire?) based cars........

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Now on my 15th/update/16th Zcar, Z's4vr....

If interested I know someone selling a P-200???? not shure of the make, but old and sporty, that's all I know.