Hey guys

I planning on getting a motor done up and i was wondering what xflow block the best
I herd that xd strongest then xe ones then xf block

Ive been told that the block with the code 87DA was the strongest

But also ive been told that 86DA a strong one which you can put a EF crank in but requires machining on rear seal. It said to be EF crank and rod are stronger
Is this true? i want to know more about if you know

Im willing to go out and buy the block if i don't have it just plz tell me what you know about the falcon xflow blocks

Thx