Below is a picture and specs for a pro tru piston. I haven't used one of these but it looks like a good bang for buck. It comes with rings from Summit for $641.99. Advantages are 1/16 ring package, forged piston and although I couldn't find a weight on it it is likely lighter than stock. Another advantage of a flat top is it will give you good quench should you decide to upgrade to an aluminum heads at a later date. Also a forged piston will be more nitrous friendly should you decide to do that.
I did some rough calculations for compression ratio. Please check my work before you commit to anything. I think it is important to deck the block. I used .006" in the hole for my example. While not critical for an open chamber head it will be important if you at a later date decide to go with a closed chamber head. I used common felpro gaskets. There are other gaskets available which might change how much you deck the block.. The camshaft you chose will need to work with the compression and fuel you choose. So keep that in mind and think about how what you choose now might affect any changes you do in the future. Above all have a written plan on paper before you buy anything. Good luck with your build.
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