"AMC style lifters" This sounds like a hard-to-find part, doesn't it?
BUT
If you go to the lowbuck auto parts store and ask for a hydraulic lifter for a 318, unless all you get is a blank stare, or a hydraulic roller if the person behind the counter knows what a lifter is, you will in all likelihood get a 2011 lifter. This is the "one size fits all" lifter which works on both AMC and Mopar applications, and is in fact the "AMC-style lifter" that is needed for the Mag head conversion.
What's my point? Almost every aftermarket 0.904" diameter lifter that you will ever see is the "AMC-style lifter." They are actually hard to avoid if for some reason you do not want the little hole in the cup on top of the lifter! I did some market research on this last year and if you can find the no-hole lifters they cost about twice what the other lifters cost. So if all that is holding you up is the lack of an "AMC-style lifter" you don't have an excuse any more.

R.