So you have an AQ171, aka 251DOHC.....
Is it a centre thrust or rear thrust crankshaft? If it's rear thrust, the crank is worth keeping or re-selling - these forged steel cranks are desirable to folks wanting to convert B230s to 2.5 litres.
If it's a rear thrust crank, it should also have 13mm M rods. Worth keeping / re-selling.
Pentas also had the (slightly) larger volume oil pump. If it's not worn out, it's worth saving.
If it still has both of its Solex carbs and manifold, they're worth saving, too.
WRT the exhaust manifold setup on an AQ171 - does it look something like this, in reality, once all the covers are removed? Only one I've seen in the metal was the display model in the Volvo Museum.
The car exhaust manifold is not the same as this one.