Okay, here's the breakdown.
A built Dana 44 is gonna come at a set cost.
A Chevy 350 is gonna come with a lot of residual tweaking costs.
Another fun fact. The only federal law regarding vehicle inspections is that the engine must be equal to or newer than the same year vehicle.
Not that all or even many stations inspect this but if your down the line use involves street legal use, and we are forever going greener, you may want to consider that as well.
Lastly, a Dana 35 is junk and a 44 can be geared pretty low. You will likely come out much cheaper replacing both axles than you would with an engine swap.
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