I have a 64 valiant with a 225 with a 3 speed and I know the bolt pattern on the cranks changed over one of the years. What i need to know is will a 225 from a 73 swinger with an automatic bolt to my 3 speed manual. I dont remember what years you need the special spacer for if if it even matters with the manual? Thanks Michael

http://www.slantsix.org/forum/viewtopic.php?p=105056
heres what they told me about the same, although i said 63 and 74, i meant 64 and 73, and i think its the same, good luck!

its not the bolt pattern that changed, it's the crank flange and how
it centers and fits the flywheel.
67 is the last year of the small flange, 68 first year of the large flange.
So you will need the right 'late' flywheel or have your
flywheel made to fit the larger flange. There is a 0.10" differance
in the OD (or .05 off each side (radius)) larger on the new
from the old.

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62 D100 225 3sp lwb
64 D100 A318 727pb custom lwb
66 D100 A318 4sp lwb
68 D100 B383 727 swb
65 Belveder A318 727 4d
65 Dart GT LA273 2bbl 904
73 Scamp 225 2bbl 4spOD
Old iron or no iron

Furthermore check is there that bushing for manual input axle in the rear of your new crank.

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