broken or hurt parts

i am thinking about doing a big cid motor it is gonna take me awhile
but i want to see if i can do for cheap or atleast cheap for what it will be
i am a welder and can fix some stuff so here are a few things i am looking for
block possbily an alum one but i has to bore out to atleast 4.600+
billit 4.750 crank or bigger
heads something that will flow to the hight 500's
rods and pistons i will buy new
please let me know if you know of something or have something
thanxs
jesse
320-232-5683