In re. to priming, just want to share this experience. When I got my 348/434 returned from the machine shop, the bottom end was together. I bolted on the Edelbrock heads, rockers, push rods, etc. I previously bought one of those priming tools for BBC/SBC. I guess one size fits all. From what I recall, I got some oil to the rockers on one side but none to the other side. I tried for a long time but nothing was happening. I also noticed that the collar on the shaft of this tool, that holds it in place and limits the wobbling, was allowing a lot of oil to bypass it and come to the top. This certainly didn't see correct so I went to the machine shop with the tool. Advised him of this issue and he felt the collar may be just a bit to small. Left it with him and returned the following day. He had made another collar identical to the bought one only a slightly bit bigger. It was really hard to tell when you compared them both. Returned home and tried it. It worked perfectly. Oil didn't bypass it and went to all the rockers. I do believe I used this same tool to prime my 406 SBC and didn't have any problems with it. I did that one before the "W" engine. I don't suspect the distributor shaft is larger in that engine. Maybe just a coincidence. All I know is that the slightly larger collar worked, Carmine.