Check out the HT-383 from http://www.speedomotive.com

New 4-bolt short block all machined, blueprinted, assembled with high nod crank, forged rods and forged 9:1 pistons for 2395.00, or the cheaper budget master 383 short block upgraded to 4-bolt mains and hypereutectic pistons for about 1900.00 (not comfortable using 2-bolt mains on a stroker myself).

Finish it off however you want.

I have not been able to find a decent donor block that could be clearanced, blueprinted, and assembled with a good rotating assembly for less than the above.

I'll be going with their HT-383 short block and adding Vortec heads with Comp Cam & springs. No matter how you slice, once you have added push rods, rockers, pumps, etc. it is a $4-5k endeavor once it is ready to drop in with headers and induction.