Your heads are a
major problem. Your TB is too big for the heads, too. Get yourself some TFS TW heads and that baby will come alive. 3.55 gears should be fine.
The 30# injectors should only be affecting your idle and emissions. I wouldn't worry about them too much for right now. But with those heads, 24#ers are probably too much. I have 24#ers but have my fuel pressure at 47 to make them like 26.3#ers.
The computer doesn't care what size your engine is. You can see what I'm running by clicking on my car link below
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351W 89 Mustang GT Convertible