440 rebuild ali heads? how far

many many thanks for the input everyone! i think will only be able to go with as far as my budget allows, this probobally not include ally heads however i am leaning towards getting my 906 s reworked,some kb pistons,new cam and fyull balance and see where i am at in a year or so, the weight loss would be real nice with the heads, already gone ali everything else mechanical wise and fiberglass hood and fenders a hell of an improvment.