you can use the bottom end of the 400 to make your 383 storker all you need toget is 350 block and 383 pistons the crack main need to be turn to 350 size or just stork the 400
is there spacer on the bolt between the bolt and the cross member put them between the cross member. i also changed my 84 to a 78 350trans and a 203 t case and cross member you have to drill 2 new holes for cross member and change drive shaft
got to this web page and order heavy duty inner and outer axle call them on how to get the right lengths for the axles that should fix it http://powerproracingproducts.com/