'64 Valiant SLANT 6 -rookie question (Chevy guy!).

Hello - Found a 1964 Convertible, been sitting for a few years.

Since it'll be stock (no v8 plans),
I would like to put a whole new brake system and redo the gas tank, lines, etc., swap in a running slant 6 and run it, before trying to "convince" the old engine to run with PB blaster in the cylinders, etc. and seeing if it's savable.

Anyway - Wanted to buy a running 225 and put in it in the meantime instead...make it a running car and maybe putz around in it first.

Since a '64 Valiant isn't my dream car I would hate for it to sit for a long time waitng to pull/rebuild the engine AND restore the car.
Might not ever "get to it".

Just so you get the vibe of what I am after - so I found the pefect donor car...a 1964 2-owner wagon.

Now - I love wagons and it's too nice to tear up but a car with a running slant 6, same year, cheap...and I know a little about the history of it (2 owners!).

But the Convertible is PB AUTO and the donor wagon is 3-speed.
Rookie Mopar person question...is there any difference in the engine?
Like...
Moutingn area for the bellhousing?
Extra bracketry for the clutch, on the engine casting that might make it hard to put in the AUTO car?
(I know usually they are just things on the firewall, etc., but I know nothingnabout the Mopars)

Etc., etc.
Thanks!

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