I knew i wouldn't be any help in pricing this bike. Its 2014 and in the real world, there is not much interest in a 1973 Honda drag bike among the current contingent of racers even if it is turbo charged. Honestly, the greatest and best value will come from "old heads" on this site for its nostalgic value only.
Sorry guys, not trying to be negative, just realistic. My friends that race with the old Kaws and Zuks talk about this all the time. Shameful, but its the time we live in where a bike off the show room floor, with bolt on mods, run quicker times than the old bikes we've spent tons of money on and we can't even ride them to the local bike night.
MArk, glad your friend has an attachment to the bike and will preserve it.