273 to 360 swap in a b body, any advise on an alignment problem ?

hi,
i'm attempting an engine swap in my son's 68 satellite. taking out a 273 with a 904 and replacing with a 360 and the same 904 tranny. i have the special flexplate as recomended by another thread but the engine mounts don't seem to line up properly to let the engine hook to the tranny. i have the left side lined up but the right side of ths engine seems too high and doesn't match up to the tranny or the frame mounts. i' m not an experienced engine swapper but i thought small block to small block would be easy. oops now he's driving my other car will i figure this out. i'm using the engine brackets off of the 273 motor and i'm wondering if this i my problem.
the sooner i finish this , the sooner i can go back to work on my 67 dart build. i would really appreciate any advise on this matter.
thank you,
scott