273 engine

Oh, right right right. I forgot about the water pump and outlets. Thanks for reminding us!

Dan,
The early 273 used a cast iron water pump. It's bolt-on compatible with the later and better aluminum water pump but the inlet and outlet ports are clocked differently, so you need a newer radiator and hoses. In my case I wanted to keep it stock looking and a local radiator shop was able to change the ports and add a core for less than a new radiator. It works great. Of course, your mileage may vary.

RedFish said

And since the lower radiator hose will very likely be on the wrong side for any later model engine you choose, just plan on buying a new radiator.
I wouldn't trust my rebuilt OEM 273 to a 50 year old radiator either so spending money at radiator is included either way we go. Good luck

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