As time goes on it not's about what the 'people' think is correct or not correct, it WILL come down to what YOU think is acceptable. Like Mike said about the knockoff wheels, it's the kind of thing that 'eats at YOU' over time. It doesn't feel quite right to YOU. It could be the engine, the dash, glove box or not, tires, wheels, hood scoop, fender flares, almost any little or large detail. So it IS a good question. I wish my ERA had the square instead of round tail lights, that kind of bothers me. I LIKE the glove box with the street dash, but want the Comp dash look and placement of the gauges. So I swapped my tach for my speedo position in the street dash, works for me. As long as you keep the changes/personality of the car essentially correct you won't have a problem, it won't 'eat at you' second guessing yourself later. Do the street look, with the wide fenders, works for me. Do the glove box with a Comp dash layout (good call). Get the square tail lights...
ERA is pretty hard to screw up no matter what you do, some other replicas are pretty much a lost cause from day one, no matter what you do! Careful with the motor selection, that one will REALLY eat at you down the road if your not firm about what you need/want.
I like the look of a Turkey pan, but it sure makes it hard to work/adjust the carb! I got two fours, no pan, very cool and easy to tune. Comp cars had only one carb, but I'm happy with twins.
Disclaimer: I especially like the look, feel, soul of a really accurate built to original specs replica, there very rare these days. Get as close as your budget will allow, ERA is a great place to start. DON'T get hung up on the details, do it YOUR way, within REASON and you'll be OK with it.