i think my block is cracked

salvage yards.

you should be sure 1st. it could also be a head gasket . are you leaking oil or water? if it is the block try jasperengines.com. everything is rebuilt & has a warranty.

morad parts company or tripple edge performance for blocks, but I doubt you cracked the block, more likely a head intake or oil pan gasket.

try car-part.com, I wouldn't go with a remanned engine based on the value of the car. I agree with the other post's that it may be a head gasket. You could go to a local shop and ask them to check for the presence of exhaust gas in the coolant, that check should only cost about $95.00.