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Hi all, I'm a first-time poster and I have a "Head Scratcher". I'm a relative novice, not a true gearhead. I'm building a 1969 318 to swap into my 1974 Plymouth Valiant slant 6. I ordered spark plugs - RN14YC, but the diameter of the threads (14mm) is too small. The plug falls right into the...

I recently acquired a 74 Plymouth Valiant with a slant 6, 3 speed on the floor and would like to upgrade to a 360. I have no clue as to what is required to swap these 2. Bell housings, clutches engine mounts and K-members, etc.