Are number matching or original components a big deal?

lets start with the obvious...it has been tinkered with
someone decided the engine bay needed to look like a ford or chivy, rather then a mopar and paintbombed it
now, when they did that, they didnt tape over the fendertag but rather removed it and then reinstalled it later
or did they?
im no expert at reading fender tags and I MAY VERY WELL BE WRONG but that looks like a 71 tag to me

my first step would be to compare the fender tag to the VIN on the dash, and maybe have someone more knowledgeable then me check it