The biggest issue  if the rod and main journals are the same size is going
to be the stroke.
The next issue is going to be the harmonic balancer and the flywheel.  Some
engines are internally balanced, and some are not.  I would say if the
piston skirts clear the counter weights your ok but that also depends on the
piston design and cylinder head chambers.  If she was a smog motor with
dished pistons and big chambers,  ie low compression to begin with your in
trouble.
We swap cranks all the time in hot rods for various reasons, to create a
short stroke engine, to change a short stroke to a long stroke, or a long
stroke to an even longer stroke to increase displacment to the max..  All
trying to come up with different horsepower and torque configurations. Me I
always build light cars, like Vegas, so I go for short stroke engines that
rev fast.  But we usuaully go with a longer rod when we go to a short stroke
crank, or we loss to much compression.    I dont need massive horsepower and
torque to get a 2700 pound car motivated lol.
If nothing else you have learned a lesson the hard way, varify what you have
before buying internal parts.  There are casting numbers on the back of the
block and numbers stamped into a pad on the front of the block that would
have told you what you have. On an older vehicle never trust the vin number,
it was right when it left the factory, but who knows what was done since.

Whitelightning

267,305 and 350 all use the same crank. The different part numbers are
likely for the steel or iron cranks.