1993 Chevy Blazer engine replacement

the block will bolt right up to your existing mounts, but you will come across some problems with the sensors in the new block, and the plugs in your factory harness.... i recommend getting a good used engine that will fit your model... i believe it should be a 4.3 vin W CPI... save yourself some time in the longrun by replacing the headgaskets, lower intake gaskets, oil pan gasket, etc because its 250$ for the gasket set, and maybe 2 hrs extra while the engine is out.... its less headaches down the road.