serious street power.

just my opinion... You dont have enough for a 505. 440 Source uses the .060 over bore size as advertising hype. So you wont be building a 512. Least not unless yo udo the sonic testing like you should be to stroke it. Then there.s the heads, the cam, the springs for the cam, the intake, and the carb... notto mention the new conver tor it's going to need. The car isnt as good as it could be now and a solid 440 will get you a lot faster than where you are now.