67 Barracuda driver's side engine mount

The factory 383 cars used a special K frame (http://engine-swaps.com/Pages/ProductsType/K-Frames.html)and a unique left side mount
(Mopar A-body big block motor mount bracket 1968-69 Dart GTS Barracuda Formula S)
which would only bolt to certain blocks with bosses tapped into the front of the engine. I could write a book on the eccentricities of that swap but I assume that you would rather not change the K frame.

There are conversion mounts now that solve the problem well most notably by Schumacher Creative (engine-swaps.com) They have pics and tech info if you wanted to just make your own version of their mount.

This may help also: 1967 Barracuda Go Big Swap Big Block - Tech - Mopar Muscle Magazine