Not enough of it to count. Obviously the dist, cap, etc will be worthless. You could make the coil work but why bother? The GM HEI has a nice one built right in the top of it!
HEI hook up is simple, apply 12 volts keyed power to the batt connection and have fun. FWIW, you can also just plug the stock XJ tach lead into the HEI and have a working but inaccurate tach.
Of course a MSD Pro-Billet dist. with a 6-AL would be cool to.....
Or a crank trigger MSD......