Forged 6.1 Hemi, Stock 6.4 or 6.1 heads with Ti retainers, GOOD springs and rocker shaft tie downs, off the shelf TTI headers and a Procharger F1, Vortech Outlaw blower, KB 2.8 or a single GT45 etc turbo....
Splurge on the fuel system and you could even have AC and drive it on the street.