Magnum slug weight vs...

I built a clone of the sledgehammer engine with the following exceptions. I used wiseco piston kit( pts527a3) and scat rods(2-icr26123-2124). Got a really good buy on both. And used my existing m1 single plane. Engine is in my 85 d150 and i couldnt be happier. I did have my assembly balanced. Didnt require any mallory. Cost on the balance was under $200. I provided the weights of of all the individual parts. Naylor performance in Dalzell ,SC did the balance work. I purchased the heads from ou812.