Another Mopar Off My Bucket List - Barracuda Fastback
Well... - it's in. I went ahead and sliced the cross-member where I'd planned and spread the gap about 3/8" which moved the distance between the outside holes further apart about 1/4". Then I fried it back up and ground it again. The outside was easy to grind back down to a smooth finish and you can't tell it's been cut again. However, now that it's all assembled I didn't have room to get to the inside.
Even though it measured pretty close I did have to egg-shape one hole a bit as per GTS's suggestion. Now the transmission lines up with the mounting holes and the outside two frame bolts are in. I still have to drill the inner two frame holes but I think I'll wait until I pull the transmission. There isn't a lot of room working under the car especially with that Tremec in the way.