Techinspector is correct.
A 390 weighs in at 650 and 460 weighs in at 720 ish. That is under 90 Lbs. Difference.
Techinspector is no Bozo, he knows his specs. Why...well that is because it is what he does.
Now , that being said what is it that you do?
So far All i see is someone who rudely disrupts an otherwise decent conversation, with a new, member about a possible build for a classic ride , complete with actual fact from well known and very reliable sources here.
Not real impressed with your activity here so far.
FE engines are not much more impressive.
Dont get froggy here, I am not amused. Grow up and bring some facts , not smack talk.
Consider yourself served