questions on narrowing a C body 8-3/4 axle for an A body

c body have straight axles, "cutters" they are called to sell to narrowed rear guys. cut and spline 40 year old steel, or 150 for new ones...I think new ones are more cost effective but if you are on a budget and have a local place that you dont have to ship, it may be the way to go. I knew a guy that narrowed his own rear with a sawzall, and a weight set bar and collars to true up the ends in high school. I think its still under his car!