7.3L from F-250s prior to 94 the same motor as the powerstroke minus the trubo??

nope. totally different... they are IDI (indirect injection) and PS are DI (direct injection) from factory PS are more powerful even if the IDI has a turbo on it. but you can make them go if you make some minor turbo upgrades and exhaust as well as turn up the IP and if you want, add stage 1 injectors... Theres a lot more available for the Powerchokes as far as mods go