well.....I hate to say it.....but you said yourself they did mainly phords and chebbies. I would never have chosen them for even changin spark plugs on a mopar. they should be responsible for the whole shoot and match. pullin it, fixin it and replacin it. good luck gettin um to do all that. if they couldn't do it right the first time, lotsa luck gettin um to fix it right this time. this right here is why i always recommend an industrial/heavy duty/diesel type machine shop. they have to get it right because the engines they work on COST mega bucks. they WILL consult service manuals instead of flying by the seat of their pants. good luck with all this.