Adding timing chain tensioner

Do it. And while you are in there throw away any bolts with holes in it, drip trays, slingers and such.

If there is a cup plug in the drivers side oil gallery take it out.

Drill a hole about .040 inch in the cam retaining plate where the plate covers that hole.

Then you will have full pressure oil going into and on to the timing set.

Everything else is just a waste of time.

If you have some blank Holley air bleeds you can drill and tap the plate and screw an air bleed in there.