Wait a second, you are basing your cars speed based on what the guy before sold said ? People will do almost anything to get their car sold, which includes never ending loads of ********.
Have you taken it to the track ?
Do you know for a fact, what parts it has added to it ? Sorry to say but the stock heads on 5.0's suck and porting and polishing dont add up to 300+ rwhp. It is possible to machine the heads for bigger valves and port them, but at that point it's still cast iron and you can get a much better, lighter, free flowing aluminum head for that price.
Have you taken it to the track ?
Do you know for a fact, what parts it has added to it ? Sorry to say but the stock heads on 5.0's suck and porting and polishing dont add up to 300+ rwhp. It is possible to machine the heads for bigger valves and port them, but at that point it's still cast iron and you can get a much better, lighter, free flowing aluminum head for that price.
Where do you get your information ? That 32 valve 4.6L makes 30 more torque than a 5.0 does. It is not accurate to do 5.0 > 4.6 = 4.6 less torque.