"factory LA short block stroker for the street .... "
- what size stroker ?
Depends on the block available and how good it is.
- what bore ?
As little of a overbore as possible to retain cylinder wall thickness which equals strength.
- Different main caps ?
Just stronger ones, not 4 bolt or I should also say, not to drill the block for 4 bolts.
- girdle ?
I have seen no data on this.
- stud the block ?
Yep
- cam shaft type
Solid roller
- what rotating assembly ?
Forged, top of the line, highest strength available. Look around!
- what year block ?
What ever one sonic checks best. (Thickest in the cylinders.)