Tobb
Nothing wrong with Z-cars owned a pair of 280's and my wife had a 300 turbo, the 240 was the best looking IMO--
Reason i suggested the MGA was because, many, many moons ago I had a '57 that we shoehorned a Chevy small block into--I was a senior in HS -- we called it a "poor man's Cobra"--had chrome reverse rims-- and was a convertible-- and would scream when you put your foot to the pedal.
Good luck in your search--keep your Cobra dreams alive