Chris-

I don't know. Those mounts are really cantalievered out there. I see a lot of stress on a very small amount of welds.

I would suggest looking at getting the frame mounting point lower (i.e. on the inside of the frame) to give more of a "/motor\" arrangement. or build out a platform from each frame rail to give a better angle to the block. |--/motor\--|

Good luck,
Michael