Guys love underdogs.
If you want to see evidence of that, look at the dyno section of the forum. My junky 352 dyno session has over 1800 views, while some of the other builds I've done, 445, 482, etc., with Trick Flow heads, aftermarket parts, etc., are looking at 600-700-800 views.
I don't know if I would be so adamant about putting it in a vehicle though, or giving builders a hard time because they build but don't install. I can see exactly what a change will do on the dyno a whole lot quicker than I can see what it would do in a car. I agree that driving is fun (that's why I'm working toward my own project) but there's lots of data to be had with a dyno session.
If you hadn't watched, my 2bbl 352 started the dyno session with about 190 hp. A PCV removal and timing change to 42° added 18 hp. Adding a 500cfm Holley 2-bbl added 26 hp more and a swap to a BT intake and a Holley 650DP added 30 hp on top of that. At the end of the session we were at 264 hp, which is more horsepower than my 2002 Mustang GT had, brand new from the factory.