Need help on C10 454 swap

[3x2GTO]

I'm swapping a 454 from a 1986 3/4 ton 2wd suburban to a 1986 C10 short bed, I'm using all of the original 454 parts such as frame stands, motor mounts and engine clam shells. Today, I removed all of the mounts from the C10 and placed the 454 stands on the frame. I can get the 2 bolts that mount the stand to the top of the frame in, but the 2 holes on the crossmember are an inch too low, this is the same for both sides. The frame stands had about 1/2 inch front to back adjustment on the "burb", but nothing when mounted to the C10. Is this going to cause any issues? Do I bolt in the top on both frame stands and drill the two lower holes? I was expecting the frame to be double drilled at the factory and the stands would drop right in. Thanks!