Im having a little trouble as to which heads I should put on my motor. The block is a gen VI bbc 454. Its currently getting some machine work done and im going with a stroker kit to make a total ci of 489. I have 2 sets of heads but not sure which ones are better, 14096188- rectangle port 118cc open chamber, or 10141279- vortec oval port 100cc closed. Im gonna run pump gas so i want to stay with relatively low comp and i have a high rise alum intake rectangle so im leaning towards the 188's. If anyone can offer any advice, it would be appreciated-Thanks