I have not used a FITech yet but they are very good and readily adjustable. I have used Holley (good), Professional Products Powerjection (ugh, most parts were junk, but it did have a decent computer program) and helped tune a FAST EZ kit (nice kit, programming too simple, doesn't allow you to do anything if it can't figure out on it's own)
Here is a pic of the Professional Products, it's on a 355 Camaro, about 350 hp, TH200R4, and 3.73 gears, RPM intake, and although I did not like the quality of the kit the guy bought, it gained a ton of torque and drivability.
That was when they were really the only modern game in town though, I would avoid them (assuming they are still making them) if someone comes in now asking, I recommend Holley Sniper or FITech.
Iowan, not sure why you said he needs a single plane, I know Yadkin said it fixed issues with his, but I have about 10 different versions on dual plane and single plane intakes. No requirement for a dual plane or single plane with a TBI and in no case did it even matter a bit either way. The TBI system acts like an electronic carb. I think Yadkin had something else going on
The only real requirement I preach is to make sure your intake has a second access point for water. Chevies have places to put the coolant temp sensor all over the motor, often Fords only have one.
When I install a TBI or even port injection on an FE, I have to add a bung, otherwise you either lose your heater, lose your temp gauge, or have to do something funky like putting it in the thermostat housing which makes it less accurate
Of course the picture below is of my FE, not a small block or a TBI, but you can see the added bung