LSx Valiant Build. Take a look inside...

Get another k-frame to modify. Buy a cheap 73-76 slant six K-frame that has been destined for the junk heap, as it totally doesn't matter....you are going to have to cut off the mopar engine mounts to adapt to the LSx anyway. Fab the engine mount posts and modify the lip. Done. That's the best option if you don't want to cut on your existing k-frame. 4 bolts and it is out.