what all is needed

if the car has alot of miles on it , fuel pump is never a bad idea , injectors will depend on whats done to the engine ?

With the bolt ons you mentioned, the factory 19 pound injectors are fine. Changing the heads, cam, and intake would drive a need to increase the injectors, likely to the 24 pound size you mentioned (and 155 to 255 lph fuel pump, you pick the size in that range). On throttle bodies, I've always used BBK, and liked them. On a 5.0 302, until it is heavily modified, a 65mm TB produces the best power, with the 70mm losing a little in comparison. To avoid buying parts twice, you need to decide your plan first, and buy parts to your plan, realizing in between your combination will be sub optimal. The mass air flow sensor should be bigger than the throttle body, and calibrated for your injector size.