"Fun" with adjustable rockers and hydraulic lifters

Hey, nice forum...

I'm building a 408 stroker motor for my Cordoba out of a 360, and having gone through a rather large rigamarole I'm nearly done assembling the thing. When I was talking to Edelbrock about the aluminum heads they strongly recommended adjustable rockers. I found a set at the recent car show that I attended for $75, and the seller claimed that they were original equipment from a 273. Ductile iron, clean, very lightly worn shafts, and ball-cup pushrods that were all decent. Thing is, I'm not sure how to set these things up with hydraulic lifters. Currently I have the adjusters just tight enough that I can barely spin the pushrod with my fingers.

The other issue that I'm having is that I'm worried about interference between the pushrod cup and the cast portion of the rocker. It seems that the pushrods might possibly be ever-so-slightly too long. The cup portion can be taken out of the pushrods, so if I do need to shorten them, how should I go about it? Would it make more sense to just take them to a machine shop and have them take 1/16" or the like off of them?

The main reason why I bought them when I found them is that I'd like to ultimately go to 1.6:1 ratio rockers instead of these 1.5:1 units, but since most of the aftermarket higher ratio rockers require ball-cup pushrods this seemed to be an easy and inexpensive way to get part of the way there now, so I don't have to also buy pushrods later.

Any suggestions?