The exact placement of the ground wire on the block is not very important as long as it reaches with enough slack to move a very little. If I remember correctly, it goes under the head of the bottom rear bolt from the compressor bracket into the block. If I remember incorrectly, it would be under the front-most bolt on the bracket that goes from the side of the engine to the trans bellhousing. But like I said, it isn't really that critical.

90 LWB Montero, 270k, 265/75R16, 16x8 ARE Bajas, Budget Lift, Towbar, Aux Brakes (towed with camper), Jotto Desk, remote oil filter
92 bone stock base model beater
Parting out 4 more