77 Roadrunner

I had an Aspen R/T Super Pac and it came with a 360 2 barrel. It was somewhat of a mistake on my part because it was in the show room so I test drove one that was on the lot. I couldn't figure out why mine didn't run as hard as the one that I test drove until I figured out that the one that I test drove had the E58 360 4 barrel.