From Vech's site:
11 00 0 008 414--$135.00--gasket set engine complete with pushrod tube seals R51/3-R67/3 R50-R60/2
11 21 0 016 221--$35.00--oilslinger ring R60/2 R69 R69S x2
07 11 9 981 242--$26.00--bearing main bearing crankshaft R51-R69S outside crown gear rear end R51-R68 x2
I would budget for new gaskets, new slingers ( yes you can clean & reuse them but the rear always gets battered, new slinger screws, new bearings throughout.
You also can thoroughly check out the crank, here in the UK an expert crank rebuild with new conrods & bearings is £ 350 sterling. It's a waste of time rebuilding any engine with a shot / worn crank as the engine will never run well.
See what you find when the engine is apart & then do any work accordingly.
It depends on whether you or a pro does the work, whether you remove your engine and ship it, or he has to remove and reinstall it, whether you want to limit the rebuild to certain items, or whether you want to repair everything that might need it, and then it would depend on the extent of problems found.
So the answer is anywhere between a couple hundred and several thousand. Not including the transmission and final drive.