Fuel injection throttle body

Has anyone purchased and installed a fuel injection throttle body system on there car?
If so:
What brand system?
Used on what size motor?
Do all brands use an in tank fuel pump?
Would you please provide both positive and/or negative feedback regarding the brand you installed.
Finally, how did you determine what size system to install?
I’m not a mechanic and will have someone qualified do the installation so please please keep my lack of technical knowledge in mind.
Thanks for your help!