Well, you can have more than needed and it won't hurt engine performance, but in a wet flow environment, it can...So that is the advantage of port injection. I have ran both, and like both.

In his case he is already runner limited, so maximizing port size will do nothing but help make more Hp...

For the Modman, or madman, I did not get a look at the plugs after a pull on the dyno, but if there is any tougher combo to make over 740hp on a 572 Hemi with a 6-pak & a Modman, I don't know what it is. It actually worked pretty well considering.

So back to your build. I ran a FAST EZ-efi on a warmed over 360 in a prostreet application and almost no vacuum, and I loved it over a carb every day...I had an air-gap intake on it, and milled the whole center divider out, and then put a 1" open spacer on underneth, and it really woke it up....I would feel pretty confident with the Fitech if its anything like the FAST systems. Let it learn and wire it exactly the way they tell you, no short cuts!

For fuel supply, there is one shortcut you can take, and you may or may not want to. I ran and do run a hybrid style return/dead head system. I run all the fuel up to the regulator, usually on the lower passenger frame rail, and then return it from there, but I supply the TB or carb with a dead headed fuel supply from the regulator....So up to the regulator it returns everything, but up to the TB, its dead headed....You might want to do this to keep it simple, but then again, it is a 605 and AN8 is probably the smallest I would consider using. Not sure what AN6 will top out at so I would stay bigger.

I use that now on my 605, but with a carb...Only drawback is, the A1000 pump can put out a lot of pressure, any hickup in the fuel system and the carb gets a big hit....But, I can switch back to efi with a simple change of a spring in the regulator.