I used a s10 4wd blazer rear on my 46. I had to cut the perches and weld on new ones. A couple of things measure the width I know there are two widths 2 vs 4 wd and I have been told there are 3. Watch the ratios as rears with the OD trans. usually have lower gears. The axle tube are 23/4 vs the older camaro that are 3". Mid late 80's chevrolet they used clips to hold the break wheel cyl vs later models like the early camaro used bolts.