I had a 76 Monza 2+2 I bought that had a vega motor in it. The old aluminum 4cyl was getting weak when I bought it (100K on it) so I built a new motor for it.
Buick V6 with Straight rod generals (odd fire). Lowered the compression and dropped a top end off the 1st generation grand national. garret Turbo, Draw through 4brl running through a 5 speed trans. man that thing would rip, in the 80's it would smoke the Ford 5. 0's that the kids were driving.
I guess the best beater I ever had I am still driving. 98 VW jetta TDI. 120K miles, I still get over 45mph and I add 1 quart at 5000 miles, then change it at 10K.
Now I read the topic, "looked worse, but ran great". That's easy, in one of my "poor times in the early 80's" I bought a 70 Pontiac Catalina with a 350 2V. Man that car looked like hell. Never had been waxed when I got it, the paint looked like silver primer, but after I got done fixing it it ran great. then I "customized it". little bucket seats out of some kind of toyota, and a center console out of a 69 Chevelle. I removed the back seat so I could carry my speaker system for my electric bass guitar, then I realized "while its back there, why not plug it in?"

Some times I wonder if I was the one that started all that stuff that punks are doing today? The seats were so low the door window bottom was level with my neck, and the bass speaker could rattle windows!
But If I could get any of my old cars back, I would want the Monza, or my old 70 olds cutlass.