Smoking???

[69fastback]

I have a 91 5.0 GT with AOD. The cars lets out puffs of smoke with when flooring it (more out of the right side). It is white smoke with some black to it. Hard to explain. It does not do it at idle and only a little bit of smoke hardly noticeable at part throtle. The car has 60,000 miles on it but i went ahead and had all the seals on the heads replaced (stock) and still does it. My main questions are this:
1. I didn't think it was the piston rings because of it only happening at full throtle?
2. Could this be an injector problem dupping to much fuel into one of the cylinders on the right side since the smoke is much worse out the right pipe?
3. I have also heard about the AOD causing smoke out of the right side but i can't remeber why. Does anybody know?