The P83 only, as you can see in this pic, had a covering of the engine and gearbox:
MFH made this covering, nothing to say...:
...but this kit is the "1967 Belgian GP" version:
as you can see in the above pic of Stewart at that GP, the engine cover is shorter, so the one of the kit has to be shortened (red arrow):
so I cut the engine cover, also cutting the piece with the red arrows which would be used to glue the covering over the engine:
Here the hooks to keep in place the engine cover:
On the P83 again, the engine head cover were connected to the oil tank with a clear yellow tube, one for each side (on P115 there was a stiff aluminium tube):
So, as the instructions say, I made those connections:
But, as wrote before, this is the 1967 Belgian GP:
In the same pic of before, please, look at where that connection was.
It is better showed in this pic on the P83 Stewart used as a spare at 1967 Italian GP:
Therefore that connection has to be made in the right way:
