Injector sizing, ECU etc Cosworth N/A

[fingersnfumbs]

Hi guys,
Google is giving me conflicting views.
I have a YB N/A currently running on 45's. It runs OK but planning upgrading to Individual DCOE type throttle bodies.

Engine spec is:
Ported head with bigger inlets.
Forged N/A Wosners.
Steel rods.
10.4:1 CR
Newman N/A cams PH 2/3 (288/410)

Any idea what injectors I will need? Size etc? is there a simple rule of thumb?
Has anybody used the cheepo Ebay Throttle bodies, are they anygood or should I go for Omex or Jenvey? The cheep ones are tempting
Currently fitting up swirl pot etc.
How about an ECU?
I have a lambda boss already fitted and have been told modern ECU's self tune using the sensor and dont need rolling road is this so or BS?
Any advice most welcome.

[Graham]

naturally aspirated something around 300cc/min will do injector wise.

a throttle body is pretty simple compared to a carb, so i see no reason not to try a cheap set.

self learing is possible given a wideband AFR, but you still need a map somewhere near and you cant self learn ignition, so yes you do really need a rolling road

[fingersnfumbs]

Thanks Graham,
Ignition is currently on a dizzy modified by Bestek.
I was going to leave that as is until the TB's are all done as I didnt want to amplify and teething issues.
Bad move?