Damn People!
Don't worry about it. When I first picked up my 340 to rebuild, a guy I know who has a 4 door Pontiac Acadian (like a Chevy II for those of you south of the Canadian border), with a 283, told me that I'm wasting my money, that his 283 would 'blow the socks off' my 340. You just have to laugh at these idiots :)
PS, how often do you drive anywhere in your Dart or Duster, and people say 'That thing got a 340?'
Now, how often do Chevy owners drive anywhere and hear 'That thing got a 283?' .. Can't say I've ever heard it, why? Because people remember 340's.