motor plates on 73-87 crossmember swap

[harleyx2]

so tomorrow im doing the 73-87 crossmember swap into my 68. which motor mount plates are the easiest to install and not have to move the motor mounting position foward or backwards, i hear that the newer 73-87 style motor mounting plates move the engine backwards. is this true? i have a v8 with auto trans. and i dont want to have to move or modify the trans mounts or crossmember. would it just be easier to install all the newer stuff onto my existing crossmember? thanks.