You should have a PD if you run large secondaries or large primaries (1600CC).

 

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/post-pics-your-stainless-steal-fuel-system-556426/
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Don't let it scare you into beleiving you cant do it... If you are at all mechanically inclined, you can do it... I am doing the same thing and this would be a first for me also... I have only had a few probs...
1. I am still waiting for parts... (shipping error and waiting for fuel rails to be machined)
2. I decided to change all of my Vac lines while I had it apart and broke a couple of peices... I am also waiting on the replacments for that...
3. I am not sure how I am going to go about making a bracket for the primary fuel rail but I am sure I will figure it out once I get the finished rails back...
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These are minor problems which can and will be overcome... I just ask that you put a pic of the finished product up once you are done...

 

if your going to run an aftermarket FPR it will have a built in PD.