D4B Hood Clearance?

My 2 cents, the DB4's I have seen do not have the threaded boss for AC compressor brackets, is you have factory AC car.
Offenhauser did have those mounting points, but they incorrectly located the throttle cable mounting point to match the 2bbl Chrysler manifold, instead of the 4bbl location.
If you have and desire to use Chrysler kickdown linkage, that also needs some changes for 4bbl.