Well, like I said, I prefer them stock especially the body. Now the engine and drive-line thats another story however, If I change an engine, or upgrade a trans (a 4 speed is an upgrade IMO) I use mostly stock parts on the outside of the engine for stock appearance purposes. My thinking is to preserve the original look of the car. When I drive one of these cars, its like a time machine to me and I like it to look like it did back when it was made (in the USA!) Its nostalgia for me and I have seen so many "custom" upgrades that were done poorly that I think its just better to stay with the stock specs in the appearance department. A lot of these "custom mods" don't age well and I really laugh to my self when I see a rattle can mod like a black out grill on a car that did not have one. I never have subscribed to the "custom car" way of thinking. I even prefer the factory radios that came with the cars originally. I rarely even listen to the darn radio when I'm driving a vintage mopar muscle car so you can keep your after market radios as well. When I'm driving a vintage car, I'm driving and listening to the car, not the radio! The first thing I do when I get a mopar is remove all the custom junk the previous owner added and put it in the proper place...the trash can! This is especially true for aftermarket radios. If there is any custom decals or paint work on the car, that gets removed ASAP! I don't mind custom valve covers if they are made and sold by mopar performance or direct connection, other wise off to the trash can or ebay with that custom junk! Yea you can do what you like, its your car but I feel that customizing has limited appeal, First time vintage mopar owners or people that are not true mopar enthusiasts seem to like custom mods but with their short attention span they won't own the car long anyway and all their custom mods will wind up in the trash or Fee bay.
Now don't get mad at me because I like the factory look of the vintage mopars. Not everyone is a "cal custom" type of guy. These days, you rarely see a Challenger or cuda or Road runner etc cruising down the road so every one you see these days represents a piece of USA history on wheels so there is no need for "cal custom" add on mentality. As far as wheels go, I cringe when I see 17'' or larger custom wheels on a vintage mopar. I prefer the factory rims as well. Now there was a time when there was mopar muscle on every corner so I could understand the need to customize the cars then but those times are gone my friends so Leave that mopar body stock! After all, mopar had some of the best colors and stripes and color matched grill colors etc around and still define good taste to this day.