60s /6 to 727 adapter

based on what i have seen for people trying to fit a hemi 6 to a 727 or 904 with the low rather than high starter. hemi 6 and slant 6 have starter in nominally the same place
small block trans necessary.

The actions for the hemi 6 case are as follows

For a hemi 6
move dowels (more on this later)
cut off the lower section of the drivers side ear of the engine case to clear the starter motor because it gets in the way when you try to fit it in the low position.
this this impacts a dowel or bolt hole in the block hence references to moving dowels
depending on age of block you may find that the ear is a solid casting or it has been subjected to weight saving update that has the rear of the ear hollowed out.
risk the thin bit with a new bolt/dowel or get it cast iron welded up

given that a slant bell and a hemi 6 bell follow much the same pattern apart from dowel and side bolt positioning. the bolts at the "top of the clock" are the same
i'd assume the back of the block follows a similar design with a ear sticking out on 1 side that allows a high starter mount
your TF auto trans expects a low starter and the ear is potentially too fat to allow that on the lower edge.

other option is to cut up an aluminium bell and tig weld the starter area into the 727 housing in the higher position and run an appropriate pinion on the starter, but that takes a bit more skill and dexterity with the tig machine of the type that costs $$$
easier to grind off a lump of "ear" and then i guess modify your headers around the low slung starter.

yet another option is to cut off the 727 bell and get a aftermarket one bolted on via the pump bolts and an adapter like they do with chevy auto transmissions

you may be able to pick up an australian Borgwarner 35 (auto) Hemi 6 bellhousing and modify it to fit the slant it would be an easy bolt-on to a circular adapter held to a cut down 727 by the pump bolts.

not having owned a slant this is all guess...
nobody came to help so these are just my thoughts on the matter

but i have owned a number of Mopar engines and can say with confidence that many things are much the same across similar motors.
Slant 6 and hemi 6 starter position is one of them.

Dave