I’ll have to check out the Matra 12- I haven’t heard of them before. I didn’t get into racing enthusiasm until ,after, so I didn’t get to watch the early Nascar races, wish I had now. The v-10 gives me that Inner visceral gut feeling, but I’ll definitely ately check out that Matra, sounds awesome!
Matra and Ferrari were both 12’s, but the Matra was just piercing
don’t remember now if one or both has flat-plane cranks or not