You can use the 258 pushrods. Oil delivery is the same. To get more out of a 4.0 head swap, at least using a stock 4.0 camshaft helps quite a bit. The '87-95 cams are quite a bit better than the stock 258 ones. Yes, $80 is a good deal for the setup. You will want to get the downpipe from the ZJ or an XJ to plumb to your exhaust too.
1977 J-20, 4bbl AMC 360/t-18,33"s.
1976 CJ-5, Healthy AMC 360/t-18, 6" lift, 35"s.
1972 Javelin SST, mild AMC 360. Under cunstruction.
Kenosha, WI 53142
For your AMC performance parts.