I have a 350 crate/th350 trans. I have bought a set of Richmond 3.42 gears and have a chance to get a Yukon diff carrier for $150. I have a 1978 Malibu all stock for now. When I check fitment on Summit it says it won’t fit. I thought all Gbody rears were interchangeable? Question is will it be good enough for a weekend cruiser? Not really going to take it to the track. Maybe occasionally step on it or do burnouts. I have 18x8 Torq Thrust II with 245/45.