I just got the motor running today to break it in after a winter long rebuild and it sounds great with instant throttle response, im actually amazed as this was my first yblock build, 292 .40 over with cruise night special cam and a lot of other goodies, I cant wait to get this in the old truck, while running I noticed a little oil being thrown off the flywheel, not bad but it was leaking, im going to pull bellhousing and flywheel and check into it further, if it is the main can I do anything to fix without pulling motor apart ?  any ideas are appreciated, I couldn't have done the build without the help from here