I remember an el camino with a 3500 stall convertor. It was easier to push it into the shop than drive it. Not daily driver material thats for sure. Well at least not my cup of tea.
If i had a choice,2500 to 2800.
I run a 3500 convertor in my daily. Drives like normal. Even bumps when put into gear with an 800RPM idle. Sounds like that EL camino had a junk convertor or other issues.