273 with power steering...which pullies

Which pump pulley will depend on which pump you install.
The p/s belt routes direct from the add on crank pulley to pump, so it can cut right through the lower radiator hose should that hose be a tad short. A Gates hose is/was the proper OEM length. Less expensive hose from Advance, etc.., Don't shove that hose fully to the stop on the water pump. Just chit I learned the hard way. Hope it helps