« Last post by 70chall440 on August 22, 2019 - 11:12:18 pm »
I do not have either system, however I do have a Holley HP system in my Challenger with a F&B 6 pack injection system. I did have the occasion or 2 to contact Holley and never had an issue reaching them or getting a response.
As to your fuel system, yes you are going to need a return line. I replaced the entire system and used a Tanks Inc. tank with internal pump and then made lines using 1/2" aluminum tubing. You could go with one of the repop lines that are out there and just use 2 of them or you could go with soft lines as some have done; just make sure you protect it. You are going to need 2 filters; a 10 and a 100 micron to keep the injectors clean. Personally, I would not buy one of the fuel kits out there, you can make your own for less money. On my Cuda, I used the stock (albeit new) tank and then cut it open and added baffles and I am running an external pump on that one. They say the internal pumps last longer to which I cannot comment as both of mine are still working fine (the internal in the Challenger and the external in the Cuda).
The fuel system is the most time consuming and daunting, but it isn't that big of an issue. Changing over to EFI is worth every penny in reliability and drivability.