Hollinger 6 speed from memory.
Typically 2 bar boost for racing and more for quali.
Not all GpA turbo's were created equal.
Have heard rumors about equality of RS500 blocks too.
Graham Goode confirmed in an article in cars and car conversions that Eggenberger were supplied by Ford with an even stronger version of the RS500 YBD block, he said you could hardly lift up the bare block when an egmo engine came to him for a rebuild years later.
Romain in Italy had one for sale recently (pic below) and you can clearly see in the photo that the casting around the base of the bores was virtually solid compared to a normal 500 one ( which is just widened and tapers out at the bottom much like a 200 block) when viewed through the water pump hole. I cant find the pic of I have of a normal 500 one but will keep looking
