That 5.0 engine began life as a 221 cubic inch V8 in 1962. It was Ford's first venture into thin wall castings and a more or less "throwaway" engine design. They also got away from the high-nickel block alloy with that one. It grew through the 260, 289, and 302 configurations with bigger bore and stroke and finally got modified into the small block 351 Windsor by making the block a little taller to accommodate a longer stroke crankshaft. Most of the external dimensions are the same, similar to small block Chevy engines from 265 to 400 cubic inches.
Jerry
