I put that size BFG's on a stock similar year BII back when I worked at a ford dealership and I thought they'd for sure rub like heck. It was awfully close i thought, but according to the owner they never did(mild offroading). So I'm sure a 2" or so lift would be perfectley adequate. 3.73's will work fine but you will notice some loss of power. And as far as what tire will fit stock with a vehicle that's old it could vary depending on the condition of the stock springs as they may sag over time or with abuse. So one guy could get 31's with no lift and another may barely fit 30's, so take the advice with a grain of salt for your rig if your debating about whether or not to get the lift before tires.