I have a 1986 Cruiser Inc. Holiday26 boat with a Chevy305. 1986 is a break year for Chevy engines, meaning thatis the year Chevy stopped building their engines with a two piece rear mainseal, and started building their engines with a one piece rear main seal. Unfortunately for us 1986’ers, the only way to know which one I have is to pull the engine, and look at the rear of the engine. I have a dilemma: Theengine is in the boat needs to be replaced, and I don’t have access to it to doa visual inspection. I do have thenumbers off the engine block 14088548. Theintake manifold has twelve bolts. All twelvebolts are on an angle. Can anyone tellme if I have a one piece seal engine, or a two piece seal engine?