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I just added PS to my 66 Hemi and everyone said go with a small TRW pump with 5/8” size return. You also have to use a 66 or earlier box with a 5/8” return.
One thing I was never sure about on the box, the return valve is a small bolt on piece.
The one pictured is not correct for a Hemi as the correct one lies flat to the pump. But not sure if it will simply bolt on to any PS box or only a 66 or earlier box.
I feel like I’ve accomplished a baptism of fire accomplishing this change over on an early Hemi so if you are doing something similar and need a list of materials let me know.