What're factory adjustable rockers worth?

Yeah....I've seen them with the adjusters kind of loose in the rocker.....which.....yeah, maybe you could lock-tite them up, but.....your call. Just check 'em out good first. Also, see if they've had some galling going on inside their bore, where they pivot on the shaft.

I used to love snagging sets of those suckers @ Pick-A-Part, back when they were a little easier to find.....especially on the old A-100 vans with the 273's.