"Warmed up" rebuilt 383 with decent parts and factory heads should be do-able for under $2500 if you assemble. Factory heads and rods are a dime a dozen so good used cores should not weigh much on the cost.

Stroker where only the block and timing cover are factory, $5000-$6000+ depending on parts used and you assembling. As I have learned from my recent 383/451 build, assembling a bunch of aftermarket parts into a well put together motor can take many hours of work, so expect the labor bill to add up in a hurry if you have a competent engine builder put it together for you.

My 383/451 build with "cleaned up" 346/516 heads, offset ground 440 crank, and iron rockers could probably be accomplished for under $4K