What cyl heads are on your '68 400? '71 & later heads would make it a no brainer to run '71 & later style brackets & pulleys which are fairly common.
With '67-70 model heads trying to fit '71+ Alt bracket/PS will present a problem as no alt mtg bolt hole at top of the head. Many many years ago I first solved the late '60's heads & 71 Alt/ps mounting issue by flipping around a slightly shortened long alt bolt, then tightening on the front of the '71 alt bract with a nylon insert nut. Only problem is that configuation is fairly cumbersome to assemble in the car with radiator & fan shroud. Typically running '67-70 heads, a '69-70 PS/Alt setup with matching '70 wp pulley is what I put together.
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Buzzards gotta eat... same as worms.
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