Suggestions for the Best Comp Ratio, Pistons & Cam for Street 340

I thought the 1970 340 came with forged pistons . I replaced mine with Mahle pistons , a bit lighter than the stock or replacement pistons 460 grams http://www.ebay.com/itm/MAHLE-SMALL...070-Bore-3-313-Stroke-6-123-Rod-/360558829504 . XE 268 and a Holley 670 or 750 street avenger would be good .