I was a non-chevy gm guy until the age of 16.5, when my mom was in need of a replacement car.
We saw a 66 Coronet for sale across the street from the movie theater one day.
As soon as we crossed the street, I was in love.
We called the owner, went for a test drive, and my infatuation only got worse.
I begged mom to buy it, and asked that it be mine and I would pay her back, and we could both use it.
....so that's what we did.
Previously she had, in order- 1959 pontiac bonneville (with 389 and 8 lug wheels- that was a cool car), 1967 Chrysler Newport (383-2 and all sorts of features that I LOVED), and a 1971 buick lesabre (350-4, which was the first car I ever actually worked on starting at age 12).
After working on that buick, I found the Dodge MUCH easier to work on for some reason, especially the electrical stuff, as well as access to things under the hood and under the dash, despite it being a smaller car. I also found I fit better in the Dodge, again despite being a smaller car. I've been over six feet tall since I was 13, and the Dodge had more headroom, even more when I discovered i could remove the spacers under the seat tracks. I was also an instant fan of the adjustable torsion bar front suspension.
I did own or partially own 2 more gm cars at the same time and/or shortly thereafter- a 1966 olds 98 (425 rocket and that car was FUN), and a 1972 buick skylark (350-2, which was an extremely clean car for Ohio). Mom bought both of those to be her cars, but I ended up driving them most of the time. The olds was $100 and after a year the trans went out so we bought the buick.
Had I known then that all gm engines and trans interchanged, I'd have put that 425 in that skylark, and hoo boy, would that ave been fun. DIY crossbreed gs-442!
But after that, I've only ever owned ONE more gm (1985 s-10 ext cab 4 cyl, the worst vehicle I've ever owned) and ONE ford (1971 torino gt 351c 4v one of the nicest survivor cars I've ever owned), the rest of my 32 cars since then have been Mopar.