Reusing rods

So my engine is at the machine shop, and the guy there told me I should buy new rods for my 408 rebuild. Said that by the time I spend the money on new bolts (proprietary to Scat) and have the rods resized I could just buy a new set of rods. First I wondered if I truly need new bolts to begin with. They ran in my engine for 13 years, but that engine did only make about 475 horsepower. They are forged Scat I-beams that came with my stroker kit with their ARP bolts. Second I wondered if this guy knows what he’s doing. Said he wants my flexplate to balance new rods and pistons, but it’s internally balanced. Should I just get the new rods, and go with what he says? Or get my parts back from him, and find someone else? I’m also to the point that I’m regretting tearing the engine down at all. Should have keep running it as is, and turned it back into a street car.