had a '65 valiant that was radio delete. There was nothing in that car.
More recently, i made my duster radio delete. Bought an ebay repro delete plate for the radio opening in the dash, have a factory plug for the antenna hole in the fender.
I took the speaker out from under the grille but i made use of the speaker bracket. I formed a thin piece of sheet aluminum around it and made a mount for an msd box. Works perfect, just the right size. Had to drill some extra holes but its just a speaker bracket.
Yeah, the box is mounted upside down but it's not exposed to the elements and it should get plenty of air flow around it, especially with no heater box.
But anyway, radio delete rules! I'm all for taking out the radio if you do it right. Conversely, it kinda drives me nuts when people hack up a good dash and door panels trying to 'retrofit' some crummy car stereo only to listen to the same dumb music they've always listened to.