Absolutely perfect as they have been in production since the 50's. However, be aware that, if they still have the blanking plate at the back of the pedal holes, then a washer must be used on the outside (hence the slight 'rebate') to prevent the pedal thread going in to far and pushing the blanking plate off. Be very careful the first time you fit a pedal and stop if you sense that it is hitting the plate. TA used to sell the correct size washer but I have used a crank/axle bolt washer and filed it out to fit over the pedal spindle.
You could also run as a double by removing the inner ring and substituting shorter fixing bolts which can still be obtained from Spa Cycles in Harrogate.
I have them on my Pennine ( http://www.retrobike.co.uk/forum/viewto ... highlight=
) but with double rather than triple rings.
Do you have the matching bottom bracket axle etc.? Spa Cycles may be able to advise on a suitable BB if not.
Today is the yesterday of tomorrow.