Not too sure about the '64 Birds but my mom's '66 had a 428 in it. My dad and I, both hated that car because we did all the maintenance on it and it was a real bugger to work on. You had to unbolt the passenger side motor mount and jack the engine up to reach the # 3 and 4 spark plugs from under the car. The rear shocks you had to take out the back rest of the rear wrap around seat to access a small triangler hole in the body support to stick your hand into to get to the shock. But it was sure a fun car to drive and it did handle very well. By the by I am also a GM guy....
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