how can I make my 1941 Ford business coupe lower

Hello everyone, I need your advice or even what you think. I want to make my 1941 Ford Business Coupe lower. Front I want to install an I-beam axle with 4 "drop. But how can I make the car rear lower? Thank you in advance for your advices ...

Greetings Luke

 

I don't like it but we used use longer spring shackles.

My 48 business coupe I have dropped axle, raised cross member, flattened sping with reversed eyes
out back is a nine inch ford with coil overs and ladder bars. I still plan to channel it a couple inches to get it down