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Hi, Welcome to the forums.
I believe those should be adjustable hydraulic lifters. To adjust that style you would turn the motor over till both valves were closed (@TDC of that cyl) then loosen the rocker nut to start, then while rolling the push rod between your fingers with one hand, tighten the rocker nut with the other hand just until you feel the slack taken out of the push rod (gets hard to turn), then tighten an additional 1/2 turn. Do all 8 cyls and you should be set. If you had solid lifters, then you would adjust the same way, sept when the push rod just gets tight, you would back the rocker nut off and use a feeler gauge between the rocker tip and the valve stem and adjust to the cam`s specs.
Post some pics when you get a chance!
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