I think its an age thing.
In the 1980's, the youths: Teens, 20's and 30's thought Choo Choo Customs El Camino was WAYYYYY cooler than a regular, grandpa el camino. Cool kids at high school drove '69 Camaros or Road Runners. I daily drove a '71 SC360 to high school. We thought the SS Montes looked cool but we couldn't afford one and they were slower than the cars we had so we weren't that interested in them.
Old ladies drove Malibus. If a kid was going to do a V8 motor swap, he'd put it in a Vega, not a Malibu. 40 year olds and older were into Malibu's in the 1980's, not young people.
Ask someone under 55 years old, which El Camino they would rather have and they would say, this one:
The only issue with the Choo Choo Conversion is that it looks a little Cheap. If Chevy had done it would have been better and kids would have been more interested in them.