I'm going with the Holley Sniper and Hyperspark system on my 340. Will be some time before it is running.
Holley has very good tech support and on-line forum. I've seen reports that FiTech is not very good at customer support, but no first hand knowledge.
I'm also using Tanks Inc 1967-70 Dodge Dart / 1967-69 Plymouth Barracuda Fuel Injection Gas Tank
However the hole for the fuel pump needs to be opened up to install the Holley returnless FI pump. 1969 Barracuda 340 Formula S Restoration