I haven't used the Holley system but have heard they are better than the FiTech. I'd try a Super Sniper if I was going to do a TBI system.
I have the FiTech Go8 1200HP system and it has been working good for me, but the instructions are not that good. The FiTech "command center" fuel pump/surge tank setup seems to be a problem from what is posted on the FiTech facebook users group. Any EFI is going to need a good fuel system to supply the EFI Unit. I'm not sure if Holley supplies fuel filters with their kit? The FiTech does not come with fuel filters, so you need a good filter.