Any part can be free. It's getting the power and reliability that costs by way of getting the free parts to work right. If this is a mild build I'd just use the RHS Magnums.
I've heard those RHS heads aren't bad, but this is for my 17 year old brother so when I say money is tight I mean REAL tight so we use what we have around or find deals through friends/ swap meets. The plan is to put them on a mild 318 or I'll give him a spare 360 crank and have a machinist friend turn it to fit the 318 mains, not totally sure yet. As far as port work he and I will probably just set them on the work bench, turn on the light and clean things up with the die grinder.
