68-69 B body info needed...

It was the mid-to-late 70s and I don't even think we were teenagers yet and my best friend had a neighbor a couple of doors down that was working on a 68 or 69 roadrunner... Some older hippie dude and he was building it back behind his house and we can hear it revving up from time to time but we didn't see it.. then one day it was just together enough that it was running but didn't even have a back seat in it.. we seen it doing a couple burn offs out front and thought holy cow! Then one day he asked three of us if we wanted to ride and he had somebody else up front. remember the three of us hunkering down in the back seat area where there was no seat lol and turning a couple blocks away onto a one-way street with two lanes and he floored it! Holy smokes that thing took off like a bat out of hell and was roasting the tires sideways and then he bangs 2nd gear and it started roasting the tires sideways the other way and we must have been doing 90 to a hundred miles an hour where we should have been doing 25 LOL brought us around back home and that's the story that keeps ringing in my head...
Later on as the years passed I would periodically see the car around town and now I want my own...