/6 sitting up for several years what to do

So to understand this correctly the cranks changed in 68 so if I have a 67 slant it should bolt up with out any trouble? if not can I use the convertor that came in the Barracuda with the transmission that is in my 62 wagon?
Also can anyone tell me the size diameters that eachoine has so I can measure the / on my stand if it will work or not.