340 with 302 cast head for pickup

Yea were not useing those heads now were useing the X heads he originally had on the engine there fully ported and port matched to his old edlebrock torquer intake mainfold.

I think that calculator is a little off I use this one http://www.zealautowerks.com/index.html or the advanced one if I can find all the necessary info to fill in all the blanks. Because how are you only getting 10.4 with the small heads when the big chamber heads are supposed to be that high with these pistons.