Cleaning an early aluminum intake

[russcc]

I would like to use an early intake on my test engine stand. It need a serious cleaning after years of sitting on the shelf. Any solutions I can put in to clean off the crud ? I could bead blast it but that's a lot of work for something that is just functional. Why are there 2 vacuum fittings between the 2 sets of intake ports. Any drawbacks to the early manifolds other than the 1" shorter fuel pump push rod ? Thank you Fordbarners.