I'm gonna play the devils advocate on your post for a second...
I see your point...but considering the technology in these motors...they are old school compared to other things released that the time...so, a colder temp t-stat, colder plugs, etc. DO HELP...but you must be modded to capitalize on the effects. So, your saying that since I'm modded I'd be better off running a 195* and AL606's?
See what I'm getting at? I agree 110% though on the fact of putting a t-stat and colder plugs in a car that is stock pullied or close to stock is a waste of time and money.