Advanced Engineering Tech - wrong heads and cam?

I have a 99 z28 with a zl402. I have the ls6 port/pol stg 2.5 heads from texas speed. my cam is a 252/256 dur 629 lift and 114 lob sep. i recently talked to trick flow and they said my cam is to big for those heads and there 225 heads would work perfectly. Is my cam to big? should i change my heads or cam?

This was fit for the Gen III forum. Closing.