I'm thinking to buy 2004 Corvette LS1

Trying to buy a Corvette I don't know exactly what to
look for when inspecting or asking the dealer specific
questions but I have asked few questions online just to
get information.
I read that the engine heats up quick with the Corvette
2004, I asked that question when he drove the car 6
hours from an auction in Florida to South Carolina

He said: "Didn’t overheat temp gauge starts at 100
middle is 200 and tops at 280  it runs around 200 in city
with all electric components on and A/C on high  ran
around 230 on highway cruising at 75mph with all
electronics on and A/C on high and 220-225 at 65mph   
with no A/C on it ran around 205-210 "

Are those healthy numbers for a 2004 Corvette LS1
automatic transmission (prefer automatic) with 105K on
mileage on it? The car had four owners. Clean title. Also
the car has "MODIFIED EXHAUST AND SUSPENSION NO
CATS, CARBON VALVE COVERS AND CHROME
VARARAM AIR INTAKE" I asked what's the horsepower it
makes now or if it's been turned but he does not know.

Any information any suggestions I would appreciate it!