Hi thankyou for your input eschlwc, nfmisso, rccardr, wrk101 & pastorbobnlnh.

So the consensus seems to be the sunrace freewheel with which various chains work fine.

I have a couple more questions -
• Opinions on IRD freewheels?
• Will an ISO threaded freewheel damage / work better on an Italian or English treaded hub (I still have wheels to build for the international and although my preference is for English, I might end up with an Italian threaded hub and don't want any long term issues with a Record hub)
• Pastor Bob - last time I pulled apart a freewheel it had two long pieces of spring wire with two ratchets and a million tiny steel balls, and that's where it ended. I figured I needed a special tool to hold the ratchets and spring wire in place like some kind of double palette knife and them lower the cogs over. Anyway it never eventuated so I just bought new ones as needed. I'm interested in your opinion on a 40yo freewheel and chain and whether it will hold up to normal daily riding after being decommissioned for I don't know how long as the bike was found, given to a friend who sold it to me.

Thankyou all in advance, Matthew.