[Gaz64]

Look at what spare space you have within a rear wheel well, as example.

I have seen many cars modified in this way, and even high horsepower EFI cars.

Your current tank needs to supply the surge tank with a low pressure pump, typically a Holley electric pump meant for carburetion.

https://www.enginebasics.com/Advance...ge%20Tank.html

Fuel surge tank example:

https://www.ebay.com/itm/Universal-F...YAAOSwEeFVBCEE