Thanks Jim and David,
Subject matter is travel photos mostly shot in India starting from 1977. Mostly houses, temples, schools; places associated with the 120 year old monastic order he belongs to.
I am working in ARGB. I have read this doesn't always play well on uncalibrated screens, and non color managed web browsers. Out put size is 5x7 inch. Thus my question.
If they want some special prints I would be re-scanning at larger size and most likely in ProPhoto. I can get decent letter size prints from the ARGB files I will keep even if the project is delivered in sRGB.