same trans bolt pattern, yes.
the block is taller deck, so the tops of the valve covers and the exh manifolds are going to sit about 1/2" further out and up. check your clearances, especially around the steering column.
if you're going to swap the engine already, now would be a good time to throw a 200r4 behind the 350 and do everything at once. that'll give you a shorter 1st gear as well as a taller OD gear. better time slips AND better fuel mileage? what's not to like?