yes, cant find it now, search for "contact Volvo archives", they can send you the build sheet which lists engine number.
you can get an idea if you have the correct engine from this link
Engine Models At the left hand side of the engine you will be able to find the engine model. The mould-in number 4968 corresponds with the B18 and the 4969 with the B20. Right of it you will find a flat piece of ground metal containing a hammered in 2-digit number. The mould-in number together...
www.scandcar.com
Send a request to Lars, with your full model/chassis number info and ask for the production data.
lars dot gerdin at consultant.volvo.com