Great site and videos.
I thought initialy that it was based on the original Traco built engines built for rover but that was 4.3 litres with 365BHP based on a 215/3.5 liter block with a Buick 300 3.4" crank
There is a link to Wildcat so I presume that a certain Mr Richardson had something to do with the engine build
I would guess that it may have Buick 300 heads and possibly an Olds block,
The Traco engines used a lot of Oldmobile parts but the port sizes on the standard Olds heads as cast are fairly restictive but have the advantage of the valves being closer to the centreline of the bores.
There were however some special castings of the Buick heads and possibly the Olds where they had the large port size of the Buick 300 alloy heads but the smaller combustion chamber of the 215/3.5 litre engine which I believe were done for Mickey Thompson, Dan Jones (USA) recently picked up a pair of these heads.
Love the car and would love to see it running if it's still being raced.
Kevin.