magnum heads on a 416 stroker

i have a 340 30 over 4'' forged scat crank rods icon pistons that was going into my duster ,but i picked up a dakota 5.9 r/t for cheap because of rod knock so i was going to try to drop the 340 into it. did not know it was that diff, so im going to buy a 5.2 from junk yard and drop that 4'' crank into it with new pistons hence 390-392 ??