I have a 312 Y-block in my 61 uni-body. I thought that the rear main was leaking so I replaced it. When I pyt the oil back in the engine I used 5qts. Drove to work and back no more leak. Checked oil level and it was bearly on the dip stick. I added 2qts and it still showed it was about 1/2qt low. Drove truck again now leaking bad. I think some one put the wrong dip stick in. My question is does this engine hold 5qts and how can I tell if this is the right dip stick?