Hi Marc,
Thanks for the response. I'm using the early 986 S 6 speed G86.20. The dowel pins and a few bolt hole line up with the ABZ Audi V8, I can not confirm other Audi V8. The important thing is that the dowel pins line up and that at least some of the bolt holes also line up.
The problem conceived with the early 986 S 6 speed is the 12 o'clock starter pocket location. This conflicts with the Audi V8 starter position at 5 o'clock (viewed from the rear) as the G86.20 does not have a starter pocket at 5 o'clock unless you hacked a hole for the Audi starter nose cone. I don't like the idea of hacking a stress riser in the side of the bellhousing but, if one were to use a starter with out a nose cone, like the M96 starter, all that is needed is a notch in the bellhousing to clear the starter gear. See photo (if that works)
You may notice a sharpie mark at the center of the starter socket and imagine the notch required for the starter gear as it protrudes to engage the ring gear. As the ring gear is located nearly flush with engine the notch needs only to be about 10mm deep into the bellhousing and does not actually breech the outer bellhousing wall.
Marc, do you posses a M96 engine with flywheel attached?