That seems like quite a bit of effort to fix those velocity stacks. I'd assume Tamiya did it because it was easier to make simplistic molds like that. The 1:1 velocity stack runners actually enter through the angled side of the cylinder heads, not directly over top.
I'd say do what Hiro suggested. The below reference pics shows a several sensors and such obstructing the view. You also have to figure that the pic you posted was a display engine and is missing some other components.
http://pyghtle.com/Reference/Enzo%20engine.jpg