This is a SOLEX Brass Carburetor. Model MV30. I beleive this was used on Very Early British Race Cars.
Markings: SOLEX / DRP237.351-BRITISH PT AP FOR 9145/13. Made in France.
The working parts move freely. Use a a re-buildable core.
Holes are 2 3/8" on center.
I am not sure of the original application on this rare piece of automotive history.