Rebuilding the 347 would make sense unless there is another reason you want the Chevy motor (we all have our preferences). Unless you already have the 350, you will probably spend just as much or more swapping in the Chevy motor.
Sounds like you will have to pay for the fab work,
May need a different transmission due to the bolt pattern,
Starter mount is different so I don’t know if that will cause an issue,
Wiring is a little different
Pulley assemblies are different
Radiator is different
If you change the transmission you will need to change the driveshaft,
It’s kind of a chain of events that sounds easy but really adds up. I think you will spend less just having the 347 rebuilt and the car will definitely be worth more as well.
When I was going to LS swap my K5 I started adding up all the changes I needed to do and it added up quickly. I ended up putting a stock motor back in it. The junkyard 5.3 swap for $1000 isn’t realistic anymore
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