So I was on the wrong trail thinking that you are Ron Johnson’s offspring…
AFAIR Ronnie used a TVR Griffith in a few RX events, but spun it many times and became fed up with it. AFAIK Willy (aka Wim) Van Herck used one of the younger 2.3 16V engines in his own Volvo 343, but they had a Volvo workshop and that older and small engine was based on a DAF motor and the block was used by Volvo as well as Renault, IIRC.
When Allan and I were negotiating the prices of ads in my RX yearbooks or pics in my RX calendars he was keen trying to fleece me. That is why I called him a leech and he had his fun about it. When he phoned later on he always claimed "hi Eddi, this is Allan Leech speaking"…
BTW, any idea if Joan is still around and well? Did not see her since me and my wife have been to Perrancoombe in the summer of 1985. Ron died there in July 1988, at my current age 57, while planning to move back to Borehamwood, as told to me by Allan Franklin then.