R3 block info

I recently pick up a r3 block part number p4876671 which is a 9.20 deck,48 degree,four bolt 340 main siamese.This is new a still in the pallet from mopar.I don't know a lot about these so looking for any information would be great.Are 48 degree w9 heads still available or are there something else out there?What is the max stroke crank this block can take with the short deck?
Thanks
Pays to do research FIRST... your first hurdle will be finding a 48° cam blank, you MIGHT find used W9 heads but its ALL race specific stuff, each team that used those heads and blocks machined them differently, and short deck intakes and front covers are specific to the short deck, not the same as production 59° stuff