Building up my 68 340

With mild port on the stock heads I was making 413 tq @4300rpm and 398 hp @5700rpm with the xe262 , so yes you can make it with your 340 using the xe 268 . I used Mahle forged 10.5 pistons , they are lighter than the stock , and an Air Gap . Now have the Ede alu heads . There is also suspension and tires to consider if you want good times , you have 3.91 gears so that is a big help .