I considered putting in Blazer rear of that vintage in my '42 1/2t PU..I liked the fact that it was 3.42 ratio and had a 6 bolt lug setup. However, it was about 3-4" too wide and the spring perches needed to be cut and re-welded on the otherside of the axle. I ended up using the rear from a '70 Nova which was perfect for my truck.
