Should piston gudgeon pin retainers be replaced at rebuild?

Thanks for all the replies guys, now that is a really good discussion and I have learnt heaps. I have had 3 x 340 engines but never noticed that the gudgeon pin retainers were different!

I think Marcohotrod and Moper have some good points. (former: thanks for remembering I was replacing the rods - as another member remarked, "...if I was not disassembling the pistons..."). Well it is not a performance engine rebuild as such. But still going to be way better than when it left the factory, even with used pistons, but they are in such good condition and as I said, pistons for the 273 are not as easy to come by anymore. I will not be giving the engine hell, but still the occasional blat up to redline. The wrist/gudgeon pin clips are not a stressed component as someone mentioned. I was more thinking of 30 years of heat cycles and after all, they are only wire. And I have no idea if the engine had been overheated or not, as I bought it after it had "done it's time". But the engine was as clean inside as if it had only done 50k miles.

One member's answer was, "use them until they break, then replace them" I'm not sure if this was a joke or being serious. But I will not take heed of that!

I did go ahead and buy some circlips, all of A$8.20, but thanks to many posts here, I will now critical inspect the machined groove to see how they fit compared to the original round spring wire clip. And if I use them, will install with the flat side out. I certainly won't be using a screwdriver and fingers are impossible (i'm not a cyborg). I have the special plier tool for circlips, with the different sized pins for the holes etc.

If the original wire clips seem to fit better I will reuse them and I think I will probably sleep ok

Thanks