Yes Ray - seems almost like " Allcomers " in NZ, " Run what you Brung " in the USA
" Modified Production " in other places.
The Hillman V8-60, and I see the Morris Minor in the drivers notes with ALTA overhead valve conversion - that would be a rarity - even more so in the USA.
Grand Prix - with Fred Allen in the MG Special as well as a 100 - pre his 100S as mentioned - came second in the MG in the Sports Car Race and the " Grand Prix " event.
Jim Ferguson in a Nash Metropolitan, another of the guys who ran at Sebring 1955 in a 100S.
More to follow on the 100S and the Sebring 1955 event, March, before Macklin went to Le Mans in SPL226B - the ill fated event.