Valve cover of that design was used in late 67 through 70 Elan motors. If it's got a 4 bolt crank (the number of bolts that secure the flywheel) it is not as desirable as a later 6 bolt motor. The 4 bolt motor has smaller main bearing caps, and is a rope seal at the rear versus a nice rubber seal used on the 6 bolt motors. It may even have the weaker 113E connecting rods. Although it may have a weber head, the majority of the weber heads did not have cam follower sleeves, especially on the exhaust side. That means the cam follower rode up and down in the aluminum head. Later heads or modified heads had metal sleeves installed that allows the cam follower to ride up and down in the sleeve, not the aluminum head. So although it may be a weber head motor and it can have some value, it can cost a bundle to rebuild correctly. This motor appears to be the lowest output version at 105 HP gross.
For instance, it can be rebuilt for a nominal cost if there are no updates done but most of the time that leads to reliability issues. Example: the rope seal is almost impossible to install and not have an oil leak. That can be resolved buy updating the crank, the pan, the rear main seal carrier, etc. And some of those parts are getting hard to find. 113E rods will work but are not recommended for any performance duty. Don't plan on many runs to 6000 rpm. Of course, the cylinders will most likely need to be honed or bored. If bored, new pistons will be in order. It will most likely need new valve guides and a valve job. If it hasn't had cam follower sleeves installed the cam followers can be loose in the head causing all kinds of horrible problems. Etc, And if it is a 4 bolt crank the block will not be one of the later blocks that can be bored larger. If it's a 4 bolt block, there is a possibility it's already been bored to within a few thou of it's useful life already.
Feel free to ask me any other questions. Frank