Looks like Monogram put a little more effort into their '78 than MPC did. Dashtop and windshield wiper tray are far more accurate, and Monogram even took the trouble to show the roll-up cover tarp in its retracted form.
Internet pics of builds also indicate that this kit features the more powerful L-82 engine, as opposed to MPC's base L-48.
I can't wait to see how you do the mirrored t-tops. Hint: for accuracy's sake, you'll need to show that they leak profusely in heavy rain....but I'm not bitter.