I suspect that car will be for sale for a lot longer at that price. There's a difference between a car that was bought by a racing team and raced from the start, or was built specifically for racing, and one that rolled around as a passenger car and then modified later in life to be a race car. I think the car, as it sits, is being more negatively impacted by the racing mods than benefiting from them.
Next problem is this car also misses the survivor mark since it's not original paint and has a warranty (maybe) engine in it, and these aspects lower the value as well. A car that's old and dusty with a lot of patina makes big bucks these days, but only if it's nearly all original, and this one isn't. I also would have a problem with the engine. The owner says it was rebuilt, but it is incomplete. Normally when I see a rebuilt but incomplete engine, it's not installed in the car. This engine is installed and missing a lot of parts, which lifts some red flags.
Factor in the fact that the E-body market peaked a long time ago and has been declining, and I would be surprised if this car sold for more than 50% of what he's asking for it. I'm thinking $40k tops.