Having someone say it's a stock 350 is probably for a few reasons: 1. the guy doesn't want to reveal his "speed secrets", 2. the guy is too lazy to explain anything to a "ford guy", 3. The guy doesn't know anything about cars, or 4. The vehicle is actually stock.
If people ask me what i've done to my car i usually summarize/list the most "important things" because if not the person i'm talking to gets bored. I usually just say "a ton of bolt on stuff", i usually invite the person to see for themself because a picture is worth a thousand words.
I suppose it also has to do with how often the person is asked the question. Until i raise my hood, no one asks anything unless it's another 5.0 mustang guy, whereas if you have a bad@ss tubbed Olds 442 you may get way more questions than someone with a more common car.....
....i'm just rambling and not making any sense 
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2005 Suzuki Hayabusa GSX1300-R
1980 Ford Thunderbird - 255 V8
ported heads, 5.0L ported stock headers, O.R. H-pipe and Flowmaster 2-chambers, dual roller timing chain
hi-po Mack Truck hood emblem
1985 Mustang GT 5.0L T5, F-303, GT40p, headers, off-road h, flowmasters, MSD stuff, etc.
Sold 02/06/04 
1989 Mustang GT ET: 13.304@102.29 mph (5-24-03)
Sold - 1998 Mustang Cobra coupe, 1/4 mile - street tires: 13.843@103.41 (bone stock)
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