Why the He** doesnt my tranny mount up?

I have the correct 1970 crossmember and the right mount... it fits in the crossmember perfect. the problem im having is its a 1 inch to short to bolting up. like the tranny needs to go back one inch.....the bolt threw the mount to the tranny will bolt up but then the crossmember wont bolt to the frame...

basically its like the engine and tranny have to go back 1 inch... maybe i have the wrong motor mounts? i have the biscuit types off a 360 that was in A ramcharger.. motor bolted in fine...

its a 340 bolted to a 904...