If you run too small dia of hose to the air cleaner from the valve cover. The air will travel too fast and pull oil into the cleaner.
I used my spark arrestor that was stopped up. Poked all the junk out and used steel wool on the inside. Then used 2 Ford PVC elbows and about 12" on low pressure oil line. To the bottom of my Summit 14x2 air cleaner.
Sorry I don't have the Dorman numbers handy for the elbows. But the fit the OD of the spark arrestor and the air cleaner. And the OD of the hose will push into the ID of the elbows. I used a dab of Right Stuff as a glue and seal just to be sure. Along with small hose clamps on the arrestor and air cleaner tube. Just to make sure it was sealed tight.
But works well and almost looks like an OE hose.
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Mark Fredrick
Madisonville Ky
1978 Terra

345 V8. Edelbrock 1406 carb, MSD,Pertronix, 392 4V Intake.
1974 Scout II "Tiger" Soft Top 4X2 (My Bride's Scout)