Your original post stating that you had too much metal in the oil strainer is probably due to the rear main beating the end play out of wack. I'm betting that they will have to machine the case for oversized rear main.
Also, as Snu Snu stated, anything 1776 and up will have to have the case and heads "fly cut" to accept larger cylinders. The heads can be purchased already machined fairly reasonable.
For example, here are a pretty decent head from CarCraft:
http://carcraftstore.com/cylinderheads-stocktowild.aspx
For the big valve dual spring setup and opening it to 90.5mm for building a 1776, they are about $230 each.