The engine was made on 9 April 1976, and the mower was probably made say 6 months later, though the exact lag would depend on shipping schedules from the US, and the amount of engine stock held by SB at the time.

Here is the Illustrated Parts List:
http://bsintek.basco.com/BriggsDocumentDisplay/Z6jmvGVJ1DajI.pdf

Here is the Operator's Manual:
http://bsintek.basco.com/BriggsDocumentDisplay/lrvvA-wU7eL7hAxB91ObQ.pdf

That engine has the Vacu-Jet carburetor, a simplified version compared with the Pulsa-Jet, which had a fuel pump built-in. Your engine has a shallow fuel tank, and the (pump-less) Vacu-Jet is perfectly adequate for that situation.

You will be aware that your engine, being a first design generation type (second digit of the model number is zero) has a metal tab which flips across and shorts the top of the spark plug to ground, rather than a conventional kill switch. It also has a pull-out choke of a type which I have always found rather awkward. Generally though, it should be both durable and very reliable.