Replacing ‘67 273 with a ‘78 318 questions

nm9stheham said
The snout on the TC is smaller diameter for '67 and earlier, than for thr '68 and later TC snout. So if that early TC was used, then a thin ring would be installed inside the larger, later registration hole in the back of the crank to fill in the gap in the diameters.
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Adapter/bushing looks like this...T-Flyte Patty use to sell them, but he's out of business now...
dart-08-jpg.jpg

...and if the new engine has a cast crank, you'll need a B+M weighted flexplate to use with the old trans.