440 build questions

My budget isn’t huge but I’m not planning on throwing an engine together with junkyard parts either I want to do it right. I was just hoping I could use the few aftermarket parts I have and apply them to what I have in my shop already. someday if I have 10k laying around I’ll do everything I need. But for now I want to put something together I can have fun with. I have 4.30 gears in the car and a 727 with a mild build and manual valve body. Without anything done in the bottom end is it even worth spending all the money on heads or will the 906’s do the trick?