If you are using a wideband then 14.7 is too lean for under load and most big cammed engines like it slightly richer at idle.  Minimum should be 13 under wot.
 
I am helping a mate to turbo  a pinto and for 200fwhp I would not even think of using less than 30lb injectors, that size will do about 240fwhp max.   205cc injectors I believe are about 20lbs and thats no more that 150-160fwhp. 
 
There are now a lot of fairly powerful ecu's for very little money, both 2nd hand and new.  Megasquirt II's are apparently pretty good.  I know delco hack is another. 
 
 
 
 

http://www.witchhunter.com/injectorcalc1.php4
 
205cc is way too small

After being told that, i checked my part numbers, and not sure how i got 205cc in my head but they are actually 315cc( or there a bouts)...apologies for the confusion there.

 To utilise what you have there you need a cold start air bypass. commonly used on earlier efi cars, once you have one of these installed. you then need to adjust your idle speed and mixtures etc at normal operating temps and cold air bypass will/should allow for stable idle while cold and warming up providing the air fuel mix and timing are right.
an example of a common cold air bypass valve

Or another method(although not prefered) is to use electric solenoid , however this would be operated by the driver via a switch. these are comonly found on toyota engines 1990-2000 as an a/c idle up solenoid.
here is an example( this particular one is on/off type solenoid but is adjustable ) 

Although very very agricultural microtech can be adjusted by those who know what they doing.
 
Cheers
 
 
 
 
 

Thanks RS2000, appreciate the response. After reading these articles I have gone with peoples suggestions and decided to move away from the computer I've got and ordered a megasuirt II.
 
With this, I'm hoping to be able to utilise the standard for sierra IAC valve, which they said i would be able too, is this correct ?