Differences in slant six

The simple answer is yes but there are some differences that need to be overcome. Judging by your avatar, it's not a '67 and earlier crank, correct? '68 -up cranks came in both automatic and manual versions. The manual cranks had a final machine process that finished the end of the crank for a pilot bushing. Most automatics didn't get this final process. The cure is to use a magnum engine pilot bearing assy (with spacer ring). It fits into the convertor snout hole. Problem solved. If you're using a '67 and earlier crank, you'll need to have the pilot hole machined to the proper diameter for a bushing or if you're cheap like me, cut a bushing down to fit the smaller hole on the automatic crank. I run a brake cylinder hone inside the hole just to get it even and then do some measuring with a caliper to see what you need for diameter and then cut the bushing to fit. You still want the bushing to measure a bit bigger than the hole so it fits tight and won't spin on you.