Fuel system recommendations?

[roguegeek]

Ok, so apparently Rick's is offering the Restomod tanks with cutouts on first-gens, but not second-gens. I grabbed the first-gen Restomod tank through MCB and will just have to modify the fuel filler or be ok with it sitting a little higher. Everything else fits just fine. 2 week turnaround time, which is pretty damn good these days.

Now I just need to figure out what I need from vaporworx. Using their Selector Tool, it gave me the following kits if I'm staying under 750hp:

• PressureWorx ZL1/Universal pwm fuel module controller
• PressureWorx DW300C Returnless PWM Kit

Could use some help here. What's the difference and which one is going to best suit my needs?