Question about balancing rotating assembly

I did extensive research on this topic along with the help of @nm9stheham. After being told I had to get a rebalance when changing the pistons. I did a lot of reading and talking with guys and even the machinist that is doing my machine work all told me for a street car it's not necessary. I bought a book from a member here and even it says its not necessary. I talked to a guy I work with who is a big mopar nut like me and he said he has been building mopar small blocks for 30 years and has never balanced one and has never had an issue even in his race car. He told me he built a 360 very similar to my build except he used kb pistons instead of speed pros and he did not have it balanced! He said he sprayed it with a nitrous and it was running in the 10s in a 68 barracuda. I have no personal experience with this just a lot of hours talking and researching but here soon I will when I get my engine back together. But from my research I'd save the money for something else and send it!