Any way I can convert Quark docs for viewing on Intel iMac?

How do you mean convert? Quark should work okay under Rosetta, and read both PC and Mac Quark files.

Or do you mean you don't have a copy of Quark?

The 2 best methods I can think of off the top of my head are to either output the files to PDF format which can be read easily. Failing that screen grabs might offer a solution

Screen grabs from OSX will work ok even on classic apps.

Quark might let you print to either a PDF or a Postscript file from the print dialogue under classic.

http://www.versiontracker.com/dyn/moreinfo/macos/3595

The link above might help if the app will run under classic

When you go to Print, use the Copies and Pages pull down to select Print Settings. There's a button on the lower left marked PDF that will save it as a PDF in OS X format. That's under 10.4.4. On previous OS versions, I'm sure it was called Print to File or something similar. Apple have changed the names of some of the Print dialogs. Basically you are looking for the save to file options.

AFAIK, the PrinttoPDF XTension requires Adobe Acrobat to be installed (the full app not the Reader), if my memory serves me well.