rogue

Can some explain to me (or direct me too)the diferences in the p90 and p80(if there is such a thing), the LY hemi and whatever other heads can be fitted to an l28, bearing in mind that it will be stroked and bored to approx 3 litres i have a reasonable budget and i wish to make as close to 300hp using an N/A set up, and have heard that this is possible. I have also heard that the LY head is the strongest and the most suited for large or larger hp set-ups. in essence i am looking for someone to tell me the most desireable head to use on a racer and why. any help would be apprecated.