.10 eh? I'd say you are in a positive equity situation with that purchase.
I've got that book on my shelf, and when AQ first published that volume, the 917 feature was very insightful. In the almost 40 subsequent years, a whole lot more has been revealed and published about that mythic beast. However, the book still stands as an excellent example of auto-enthusiast publishing, "back-in-the-day"
.10, I'd say
extremely well bought.