[masraum]

1970, so that's a tough one. Lots of great American muscle in 1970. I'm not a huge fan of most of the sports cars from 1970 (I prefer the older cars of the 50s and 60s because they are usually better looking).

Here's a few options

muscle
Chevelle LS6
Buick GSX
HEMI ‘Cuda
Ford Boss 429

sports
Lamborghini Miura P400 S
Ferrari 365GTB/4 (althought the 2+2 is a prettier car)
Porsche 911 S
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Jaguar XKE
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Based on the list above, I'd probably go with the Miura. I love the other cars. I love muscle cars, but probably prefer sports cars just a bit more (although those are the cream of the muscle crop). And while I'm sure the '70 911 S is a great vehicle and I'd give a testicle to own a good copy today, I'd have to go with the Miura.

< edit >
I have to revise my answer, I'm not sure which I would choose between the Miura and the XKE, but I think I'm leaning toward the XKE.