Lotus Super Sevens made interesting "kit cars". Once saw/heard a unique one at the Reading, PA airport road races in the 60s. Sounded like a 900 pound McCullough chain saw. Had a modified SAAB 850cc two stroke in it. Also recall a few auto crosses in our area, that some Cosworth powered ones showed up.
Guy down the road from where we live now, had a 289 Cobra in the late 60s. Wrecked it, sat out behind his house under tarps for years before he finally sold it. His buddies had 'Vettes, he wanted something different.