Neutral balancing a 360?

I've seen one that was internally balanced. It had the counter weights on the crank cut down a little and the throws turned to run 6.125 SBC Scat rods. It had off the shelf .030 pistons for some kind of SBC. I think it got just a small amount of Mallory metal, but it was smooth as silk when it ran. Had a set of iron Seedblaster Magnum heads with an Edelbrock Performer RPM intake. I watched it make 388 HP with a nice torque curve.....thru crappy Magnum exhaust manifolds! It went into a 74 Power Wagon....lol.
He did mention the possibility of an internal balance with lighter rods and pistons, along with some mallory metal. I think the Scat I-beam SBM rods are about 100 grams lighter than the stock ones. Not really wanting to spend the extra money on this build though, especially for "special" machining and fitting to get the SBC parts to work. He also mentioned a forged Eagle crank which is internally balanced, but again... $$$. Which would be OK on a hot build, but this is intended as a (mostly) stock type re-do.