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The barb fittings on the pump would definitely be easier and the only difference to the way it was later done by Packard is their pump hose connections were actually small nipples in ports cast as part of the pump housing and not thread ins.

On the horizontal tube run, it was 1/4 in steel tubing. I see one of the special port plugs with a stud end that is on the longitudinal oil gallery. That one is located just forward of the crankcase vent tube. If there is another simiar plug or maybe something with an ordinary bolt hole closer to the pump the horizontal tubing was supported by loop type tube clamps. The ones on the gallery plugs had legs 2 or 3 inches long. The hole in the clamp legs went over the stud and was held by a nut and washer. The legs were bent in such a way as to position the tubing closer to the block laying in the void just above the oil gallery. At the firewall end it was bent upward. Since you have the tube on the firewall then a few inches of rubber hose would be the connection.

I can't speak for 22nd and 23rd series cars, but 1951 through 1954 were the same with short rubber hoses and push-on fittings at the pump and the vacuum booster section was at the top. No flares involved but the fittings on the housing were pressed in brass or copper, not cast as part of the housing.

Don is correct. I should have said "small nipples in port HOLES cast as part of the pump housing". The way I worded it would lead you to believe the nipples were physically an actual part of the casting. Not so but I also don't remember them as being brass however it is a long time since I looked at one of those pumps so he is probably correct there too..

Joe,
but be aware the lower radiator hose shown in this picture, unless it is the reinforced type, could be subject to failure.




EDIT - Sorry Joe should have addressed my post to Bob J.

No worries, it is.
Bob J.

Here’s a view of them (left side) on a pump that I recently rebuilt for my 1951. They might be copper but I'm not sure.

As far as the lower radiator hose is concerned, I believe it should be a steel pipe with short rubber hoses to connect it on either end.

Guys, thank you so much! Many curiosities solved here. I've seen those studs/nuts and always wondered. I just sort of assumed that someone had put them there because they didn't have a proper plug. Makes much more sense now. I'll track down some parts and get this all strung back together. I'll post a picture of the solution once I get it wrapped up (some time next week). Thanks again!