I was wondering the samething. I have a 1998 sport with the 5.9. Love to have a Viper model (dont see that happening anytime soon.) I knew some older models came with a v10 and if parts would interchange. But would the time,
effort,and money be worth it or just keep with Sport 5.9 and modify from there. Add newer front and rear suspension to go lower and new 20" wheels (have a set off a 2013 need to sell or make fit my truck).