Always looking for more info about my 1951 Packard 300, so when looking up the Carter WGD 767S I found that the 1955 Pontiac Safari used what was almost exactly the same unit with different ID numbers. It is more detailed than some sights and may be helpful when rebuilding or adjusting. Here is the site:
http://www.pontiacsafari.com/55/ShopManual/6B%20-%20Engine%20Fuel.pdf

Thanks for all the suggestions!
Owen_Dyneto -- From the sight you noted the one they have is 7# for '51 - '54. I finally paid the price and ordered one from Max Merritt. The one shown on their page said it was 13# but the one I received said 9# on it. So far it seems to be working as intended without leaking. Maybe the 7# cap that I had been using was defective.
Thanks again!

Thanks to all the responses!
My intention was to find a 13 lb. cap at a reasonable price. Max Merritt and Kanter both have caps that are $40 + and I might just have to pay extra to get what I want.

Wesley Boyer --
Watching your videos were a huge help! Removing the pan on a 1951 327 is close to being the exact same process. Thank you for taking the time to make the videos with narration!

https://www.packardinfo.com/xoops/html/downloads/servicemanual5556/Sect09_Engine.pdf
On page 23 it tells what the tappet clearance should be.
One way to find information is to go to the "Search" heading at the top right corner of the page. To find this info I went to the section at the left "Packard Literature and Manuals" and went down the page to "Service, Shop & Training Manuals", clicked on "more" and then down the page until it showed "1955-1956 Packard Service Manual". Then click on "Engine". Hope this helps!

Thanks for the detailed info about adjusting and cleaning the lifters. My '51 300 has the 327 engine, makes a clicking sound after it is warmed up thoroughly, and I have been thinking about doing the same thing. Your pointers are much appreciated!

Photos are so helpful! I have been curious as to exactly how the high beam indicator light fits (without removing the panel) and in this photo of the back of the instrument panel it can be seen easily. Thanks!

So, after looking on ebay I found what appears to be a rig to replace the original. I'll try that!

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I have a 1951 Packard 300 with a hole in the muffler. To replace the exhaust system, the Service Manual says to remove the u-bolts from the supports. My car does not have this type of supports. They are made of reinforced rubber and are attached to the pipe by a mounting piece welded on the pipe and rivots attaching it to the bracket which is bolted to the frame. Has anyone else delt with this type and are there any suggestions about remounting?Thanks!