I have it as an Elva Michael. You can vaguely see the bonnet badge. I'm afraid that with the advent of the Lotus 23, sports car racing changed forever and the cars all started to look the same.
I think the Felday has been discussed on here before, but as initially, I didn't keep a record of what I had posted, one or two of the earlier postings may reappear. Jim Clark did indeed drive the Felday, but not sure when without consulting Google. (Added: Jim Clark drove the car in 1966 - Guards Trophy Race.)
I noted in my diary for 27/12/1965 - it was the only entry worth transcribing to the old diary spreadsheet I have been building - that it was the first time out and beat the McLaren Elvas at Brands Hatch - televised. Won 1 race and second in another (to a McLaren). According to my diary, an 1880cc engine (probably BRM). Also reverting to my diary, apparently the first day I wore a string vest!!! I'm sure that conjures up an image you'd rather forget.
"Departing from previous Felday spaceframe chassis practice, Westbury built a sheet-steel 'monocoque' backbone structure for his 'Mark 4' with the BRM V8 engine turned about-face at the rear, clutch at the front. A short propeller shaft then ran forward to the Ferguson FF gearbox and control unit, mounted in unit with the front-drive assembly. A jointed prop-shaft then ran back from the control unit under the engine's left-side cylinder bank to a rear-drive differential unit."
The car was built by Peter Westbury (this was Felday 4) and the driving often shared with a Channel Island co-worker, Mac Daghorn, who I think drove the car in that first race.
The above quote was taken from:
https://www.bonhams.com/auctions/21906/lot/306/Well worth a read, as there are links to the Ferguson P99, which Westbury drove to great success in the hillclimb championship, and the Techcraft BRM 4WD.
