Thanks once again George.
As mentioned, my previous 351c engine ran both the restrictors and the tappet bore bushings with a hyd flat tappet cam and thankfully with no ill effects for many years and miles. The benefits of good constant oil pressure made it worth it for me so thats the way I think I will go again.
Unfortunately the work to restrict no 1 is way beyond my capabilities but I will have a chat with the machine shop that will be doing my tappet bushings and check with them.
Cheers
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