If it's a sedan, the car will have IRS, which means the rear brake calipers and rotors will be totally different from your car. (But if the passenger side rear caliper isn't seized up, I'd buy it from you. My 780 needs a replacement rear passenger IRS caliper.)

Also there were some significant changes to how Volvo assembled their wiring harnesses that occured in the changeover from 1987 to 1988. You'll probably find the newer style of connectors ("Timer" and "mini-Timer") used to connect the engine harnesses to the vehicle chassis harnesses. However, don't let that deter you from grabbing the '88 harness since it's not biodegradeable like your '87 is, -and then splice on the '87 chassis connectors to the '88 harness. It's worth the time, rather than replace each individual wire in the '87 harness. You will need both the '87 and the '88 Volvo green wiring diagrams manuals for this operation.

Is the car worth $250? Consider this, the value of the car in scrap steel alone is between $100 to $150 depending on your location and market demand. The Nivomats alone retail new between $200 to $250 each, the headlight/foglights/grille section goes for about $100 or so in a salvage yard, the engine head is definately worth having as a backup or spare on the shelf in case your car suffers a bad overhead due to a blown hose/radiator or locked up thermostat. The turbo is worth $50 to $200 in used condition. The radiator is worth about $25 if it's the original, and a newer Blackstone (OEM) replacement is worth $50 or more (they cost about $220 to $300 new). The transmission is worth $50 to $75 for the automatic AW-71, and an M46 manual transmission with intact syncros is worth $50 or more. The interior and body speak for themselves, and are worth a decent amount to people looking for their components.

Take a close look at the '88, you may find that you want to take some parts from your '87 and make the '88 your daily driver.

God bless,
Fitz Fitzgerald.
--
'87 Blue 240 Wagon, 273k miles.
'88 Black 780, PRV-6, 149k miles.