i also have a 90 v6 3.0 and im in the process of rebuilding the heads just waiting for the heads to come back from the shop then the real fun begins :d
im in the process of doing rebuild my self i have a 90 v6 3.0 with a blown head gasket just waiting for my heads to come back from the shop anyone have any opions on what else i should change while im in there aside from the water pump and timing belt