I too really like the look of the flat rads with cycle wings, and if my memory serves, there was/is one that was modified to quite an extent and identified as Black Sheep..? Think I read of it in Miscellany a few years back, looked the business..(-:
The Black Sheep is a flat rad +4 owned (and raced) by Barry Sumner.
It has been through so many iterations that I had totally lost count of the chronology but suffice it to say the power plants I have seen in it are:
Standard Vanguard
Ford Crossflow
Ford Zetec
Rover V8 (highly tuned)
Ford V6
I will try to dig out some photos sometime.