Triston Valadez

Hi I'm new to this thread. And I have a complete lq4 engine and trans . And I'm hoping to swap into my 1971 Impala. I'm trying to build the best engine I can on a budget. I was thinking of getting some 243s and getting the fast lsxrt intake and dropping in a cam. But I also want to swap some ls3 heads and intake on it.
Anyone know what kind of Hp gains I can expect from this