I ran a 318 in my 340 Swinger with the scoop badges and dint fell no kind of way, in fact old heads would come up and say " is that a 340? that sounds good..."
It kind of reminds me of growing up in the 80s/90s and a 69 Camaro on the street with 302 badges, they never had 302s in them...
my car ,in primer ( see my avatar pic) drew alot of attention and I don't know why...