Torque convertor vs turbo lag question

Thanks-I will order one. $37.00 I can't go wrong
I already have the GT-45 and it was a pretty inexpensive newby Turbo $260.00 This is kind of a science project for me. Lots to learn.
I did read a smaller turbo will spool up quicker for better low end?
Sounds like I may run out of Turbo on the top end. Putting the 383 in a truck so limited RPM

Thank you for helping!