Since nothing is bought (car or engine), I suggest you continue your research and see what kind of budget it takes to obtain the car and engine you would like to have. See how much rust free Duster's run in price, heads of different types, and see how well it stacks up against your funds and then make decisions. Nothing wrong with coffee shop talk..... as for speedmaster heads, I did a home inspection on them and found nothing wrong, and they've been on my car close to 2 years issue free. I don't drive it much, though.
- P.S. - It's hard to say you are looking for "cheap, budget" and then quote your Dad saying "cheaper isn't always better". Little bit conflicting. Again, coffee shop talk. Do more searching in the for sale adds online