ugh ...men never awnser directly .....to awnser ....on passenger side of the engine ....where the head meets the block .....there sould be a rail on the block side on surface faceing up on the block...prolly greasy and towards the front should say engine displacement ....also you might google the casting number that is on the driver side of the block
also take a took at the small piece of hose connecting the water pump to the head .....that will tell you if you have a low deck (170 or 198 ) or rasied RG motor 225.