That is a project. Couple questions: why are you screening all that material? I cant come up with a reason to screen all of it unless that is how much TS you think you will need, but that seems heavy to me. Have you considered the fact you will need a SWPP in place? A 60 acre project will get the attention of DEQ, especially with a stream/river near by. I would expect a visit. I would consider this idea. With a couple pans, you could rough everything in to subgrade. THEN take your stock piled topsoil run through screener only to produce the topsoil you need, lay it out however you would like Pan, grader, dozer whatever. This will give the material time to dry out which will give you better success with the screener and your not running more material than you need. There is no cheaper way to move a lot of dirt than with a pan. A couple Quad tracks pulling two 24 yd pans means 100 yards a cycle. Considering how large the project is you will this kind of productivity and fast cycle times. Ground speed on a scraper is a little faster but their cost per yard is higher. Either way. A 360 and a dozer are not the way in my opinion. Like mentioned you will need a lot more equipment, like haul trucks and a lot of help.