The difference between the models..??? And more

Now would be a good time to buy… The 70 4V has very different heads and exhaust manifolds over the 2V. The 2V is actually faster off the line than 4V.

https://secure.cougarpartscatalog.com/store/p/15286-Cylinder-Head-351C-4V-Closed-Chamber-Used-1970-1971-Mercury-Cougar-/-1970-1971-Ford-Mustang.html?attribs=79

https://www.youtube.com/watch?v=Fizb2vo68vA