Look at some dyno sheet... A 440-1 indy head on a 500“ motor will make 100% no problem. My home ported iron heads went around 95% VE.

Especially at low boost

I didn't do anything on the turbine calculations because I was just pointing out the compressor mismatch. You can use this tool for wastegate and turbine calcs tootoo.

A 75mm on a 500“ motor not work well.