While that's a great idea it's going to be kinda hard to do.
Ex., there was a guy in B.C. who a 78 240 with 750,000 miles and no major work done, just basic maintenance.
I've got a 83 245, 350,000 km, and it's on it's 2nd engine(the present engine had the same milage on it as the previous so really it's lasted 350000 km), 2nd rear axle, original blower motor (it's been making noise on and off for 4 yrs but it still blows) original steering rack.
It all comes down to use and abuse, the B.C. guy was all country highway miles and he was tip top in maintenance. I've seen 240 in scrap yards with 100,000 that have already blown an engine. My advice is to do your maintenace, if you're into it you will notice different components that are starting to wear out and this will give you a window of opportunity to replace badly worn components before failure.
I used to have a tendency to repair things before they broke, but then after fixing one thing a previously undetected something would break and I would find that I had been fixing the car all week. This is not why I use volvos. Also the componenet failures I have had all gave me plenty of warning signs or in the case of engine mounts, allowed me to limp home for repairs.

Patrick, '68 220, '83 245.