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I'm looking at doing the same swap in a '69 B body, the Magnum motor sounds perfect. I do have a couple other questions though.
First, what motor mounts would you need, the stockers (that need replaced anyways) or something different?
I was planning on using the stock 904 and converter, any issues?
And this is an AC car. If I find a motor with the AC condenser on it
would that make it remotely possible to go with an R134 set up (If I snag the expansion valve and drier, etc..). I guess I'm asking if the old evaporator and condenser would work with the new spinnin parts??
Thanks!



Magnums still have the old LA style mounting ears on them so they will accept stock motor mounts. I don't see any reason your old evaporator and condensor couldn't be reused with the magnum compressor. The expansion valve system is likely different because I don't think the newer ones use the valve on the evaporator like the old ones and I don't know enough about them to make a suggestion on that. Biggest challenge would probably be having custom hoses made to mate everything together.