Need some help!!!
I just replaced a 305 with a 350 on my 90 iroc. As you know, I kept the TPI system but got new heads (stock for 350) and roller rocker arms. The knock sensor is new for 350 and rebuilt yellow fuel inj for 350. The engine turns but won't fire. Fuel pressure is good, fuel inj cables are ok (I used a noid light), also got a spark (yellow) when testing spark plug cables. The distrubutor is new, coils is new. Distributor is pointing #1 on TDC. Valves adjusted properly, I think. After crancking for a while and no internal combustion I check the plugs and noticed a strong fuel odor. Does not make sense since I see spar in cables. Help please!!!!

 

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Does the engine sound like there is any spark ; a kick , burp , f*rt , any noise at all ?

If the injectors are firing as you say and the plugs are wet then you don't have spark , or enough of it.
Seeing a spark outside the engine does not mean it is strong enough to fire the mixture when inside the cylinder.

Do the basic spark tests
http://easyautodiagnostics.com/gm_ic...n_module_1.php

to confirm your electrics are as good as you think

 

it may be a computer program but as vetteoz said make sure all electronics are as good as you say. good luck