YES 5.9 Magnum manifolds work in early A bodies. Here is exactly how!

75slant6 said
There’s really no difference between the manual and power shafts, other than how far they’re collapsed from the factory. All you have to do to get a “power” shaft to work with a manual box is pull the shaft out farther. It might take a little persuading as there are a few small plastic globs melted to the shaft to hold it in its factory location. To get a “manual” shaft to fit a power box, just knock the shaft back into the column a few inches. But if you completely take a manual shaft and a power shaft apart, the inner shafts are both the same length. Always blows my mind that people dish out the money for that adapter

Hold up.....you sure about that? Were talking a 65, not a collapsible shaft. There are no plastic globs in there and the shafts are physically longer within the columns in the manuals to compensate for the shorter boxes. The steering wheel position does not change between manual or PS so it cant be a shaft adjustment. Here is a 65 power shaft I extended to a manual, note distance between dimples of the old cut shaft and the manual extension I hacked from a yard shaft. Its about 2.5"