Ok Incoming I have to disagree with you.
I had a 347 dyno-ed over 400 to the rear wheels (500 ish at the flywheel) and I put over 12,000 miles on it. I love to wind it in 1st, 2nd and 3rd to 6500. Every time I drove it.
Not a problem.
The secret is zero balancing. Damper, rotating assembly and flywheel.
I think the best motor for a street Cobra is a 408 W. Over 500 hp / tq and as street-able as a Cadillac. Push the go pedal and hang on.
Check with Craft Performance
https://craftperformanceengines.com/crate.html
My 347 would spin up faster than the 408.