Boring but valid answer--  LA46.

LA46 sounds good.  I have one.  Thanks

A friend of mine built one and did it as a I beam. It looked just like the original from the outside but was much easier to build. He used a Fox 35 and it was plenty of power. I flew it and it was easy to fly on 60ft lines. He also built Larrys Sky Devil as a Ibeam. The Grey Ghost and the Sky Devil are very similar with the GG being larger of the two.
 Dave was a master at clear silk and his Sky Devil is on the left in the picture.
Ed

Was just reading the article by Larry Scarinzi about his Grey Ghost.  His power solution was a Johnson 35 Stunt.  So there is the answer on power.  His ship came in at 34 ounces all up.  So my challenge is to match his build weight.  I can do it.

I saw Larry fly the Grey Ghost at the last Perth Amboy, NJ contest at Seagull field in around 1958. This was the first contest I attended and I was mesmerized by this ship. Larry flew pretty fast and very hard corners, it was blazing, mind blowing. I think the Fox will be a little light on power for what this ship needs (although it would work great for the Sky Devil). An AeroTiger 36 would do the trick with a 10x4 would do it.  One trick they used back in the day was slightly longer lines (like 65') and let the ship fly at the speed it likes but it give you some time to keep up with it.