If it's totally original, then keep it standard. I don't particularly like some of the uprated chrome header tanks.

And there are no 'uprated' rocker covers, or charge carriers..only 'prettier' ones that have been painted, or chromed, etc.

Where to buy ? nomad, bailey, car shows are places for bargains, or just to see how various companies do these items. (For example, bailey weld the header tanks and leave then, whereas some companies smooth off the welds for a 'cleaner' finish). Depends what look you're after.

Me personally, if they look ok as they are, then leave them. If the need a clean up, you can still buy the header tanks from Ford (around £30-ish), maybe buy a good 2nd hand charge carrier, and ppowder-coat your original rocker cover whatever colour you want (silver or grey is always a winner). Make sure you clean the cover inside before it goes to get rid of any build up crap, and also after paint to wash out any grit left in from the clean-up prep the painters will do.