1968 Dart K frame’s

how can I tell the differance from a slant six and a small block V8 K frame...getting ready to order 440 motor mount kit.

I looked @ our 273 1968 Dart (no motor) and it looks like our 1968 Dart
(with motor) slant six parts car...Im lost...

any photos on the web side by side to compair? thanks !
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