Oh yeah. Isn't that head made from unobtanium?
I can only dream of ever having something as awesome as a setup like that.
There is that guy who made his own twin cam head for L series engines, 3D cad design, custom casting, CNC milled. I think that setup is even more money.
Of course you can spend plenty of money on an E31, P90, N47 . . . . . . . I think I'm into the E31 I have at least two grand when I built my first race engine. Other than new valves (missed a shift coming onto the front stretch at Seattle, on a new bottom end, kissed the valves - now I have a rev limiter) and guide seals, and later a different cam, I haven't spent any thing on it. It has been sitting since the last bottom end had a crank break between the last main and number 6 rod (the second in about 20 years of racing my Z on the West coast) at Thunderhill about 12 years ago. I am thinking of using it, and the race induction setup paired with a header and a bottom end I built for the brown car when I was married to Mrs, Racer 1.0. That engine was going to get a small chamber E88 head I have, but haven't finished yet. It is ironic that when I had the first crankshaft break, it was when I was building that other engine, and was pursuing a championship. So instead of finishing the E88 head, I put my E31 race head and intake/exhaust on it, and raced one meet with it. We had a long enough break before the next race that I was able to build another engine, and swap everything back. In my zeal to win the championship the engine got sidelined.
Then I divorced Mrs. Racer 1.0, bought some property, stayed focused on racing and the brown Z and the engine got parked.
That was about 26 years ago, more or less.
I met Mrs. Racer 2.0 about 23 years ago, and we wound up selling my place, and buying the place we have now, built a house, and the car(s) have been patiently waiting.