273 to 360 engine swap

You could have the outlet switched. You could also swap the water pump & fan setup from your 273 over to the 360. You would also have to switch alternator brackets & pulleys. This might be the easiest way since you also have the AC to deal with. Biggest problem is that your 360 will have to keep it's existing harmonic balancer & that's where the timing mark is. Easiest thing to do there would probably be to make a new TDC mark on the 360 balancer.