Wheel Hop Clamping Leaf Springs

I know these cars didn't get built with this much power from factory.. and there are many other variables to consider, but a repair like this wouldn't be my 1st option.. That almost looks like a slant 6 or base 318 leaf pack. From the looks of it was flexing like a banjo string.
Its a factory 340 car and I do have the original leafs up in the attic. Whats on car now are replica 340 leafs from ESPO. I though when I swapped them on they match the originals. I replaced them due to wheel hop and it got rid of the hop until 6 speed was swapped in.