No 289 for a real '64 1/2 ??????

[Power]

Ok, unless I'm way off on my information here goes.

From April 16, 1964 (debut of mustang) until mid August of 1964, the engine choices were a 170 C.I. six cylinder, a 260 C.I. 2 bbl V8 or a 289 C.I. 4 bbl V8 and came with a three-speed, four-speed or automatic.

In ’65 the 170 six and 260 V8 were dropped for a 200 six and a 289 2bbl V8.

hope this helps.