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If you put an early manifold on it, then you should think about welding up the TOP of the vent tube that pulls air from the crankcase and delivers it to the bottom of the manilfold - and out the road-draft tube on a stock 49-53. Then you can mount a PVC into the top side of the tube so you can have a vacuum system pulling the crankcase fumes and water vapor from the crankcase. This encourages the inlet air (from the back of the manifold) to be pulled down into the crankcase and pulled up the tube that you just modified. There are a few posts about this technique and the associated mods to the tube, to the bottom of the manifold, etc..
Personally, I do not like crankcase breathers bolted to the oil pan - every one I've ever done or seen (unless really tall - like a long filler tube) will cause oil to drip down the whole undercarriage of your car as well as your garage floor. The vapors coming out of the oil pan will carry oil mist - and you'll have oil on the outside of the breather . . . going places you don't like. Also, there is nothing on a pan breather to actually PULL the air out the breather --- like the original road-draft tube did . . . so you need a PVC to replace that original concept if you're not going to run it.
Best of luck!