[Harvey]

If I change my 390 to a 4 barrel intake and carb will I still be able to use the original air cleaner housing?

 

[68XR7GT390]

My guess is no as I would think the carburetor throat opening on the 4BBL carb would be larger then the 2BBL so your original base plate opening would be too small.

 

[mopardon]

I think it may be the same size. Measure it and see.