The shop I work with builds Mopar stroker engines all the time. There are usually three or four of them in process. They usually end up costing between $10K and $15K depending on the parts used. You can build a good street motor on a budget but you have to be super careful about part selection. It is best to work with a shop that has experience since they'll know what works and what doesn't. A lot of parts are junk these days, even some of the good brand names have gone down hill recently.