Car looks mint and body is sharp! Wagons are very practical, I`d say keep it :-)
In the worst case scenario the engine needs an overhaul. A no-rust manual wagon really deserves it, but only if necessary.
Everything probably must be confirmed from the start (about current condition).
Share as many details as you can (in this case the more the better) about what you see/hear/experience when you start/drive the vehicle. Don`t use starting fluid sprays, rather check timing as step one. Ever found oil in water or vice versa, in the time of your ownership?
There is a d24 timing tool etc kit available on ebay as we speak (not mine).
Hopefully the forum can help you to troubleshoot and also help you find parts, the needed d24 tools, maybe even d24 owners near where you live.
https://www.ebay.com/itm/Volvo-Diese...YAAOSwuDlgHzMq
Welcome to the forum!