65 Cuda V8 #s...another question.

yeah but wouldn't the intake manifold bolt heads be 9/16 on a 318? As opposed to 1/2 on the 273?
The intake bolts are 1/2 (wrench size, 5/16" shaft size) on the '64 and '65 only. You could get a 2bbl or 4bbl version in '65 but only a 2bbl in '64. The '66-7 273 4bbl intake will bolt right onto an LA318.