well parts alone are 4k,machine shop not included,even stock parts are expensive.
5 k to rebuild this engine and install it might be your price but ,just about anyone else is going to have to have someone else do the work.
putting a paxton back on a stock engine doesn't make any sense,not rebuilding the paxton after basically 8 pistons failed and you admitted to low oil pressure doesnt make any sense as well.
atleast sell the paxton to recoup some of the money and many other aftermarket parts you have on the truck