[left footed whooten]

So, is there a number, serial code, or anything that I can use to distinguish the 98 engine from the earlier less powerful models? I just dont trust used engine companies to give me what I ask for, Im used to getting the closest thing they could pass of and still make the sale, especially considering the shipping charge and cost of the thing itself, I want to be able to verify in a concrete way that I am getting a MY98 and not a runner-up.