Might have a spreadbore intake. A dual plane of course. Let me check and get back to you.
Yes, the 305 will work out fine for the time being. When you pull it apart, look the bores over carefully for scoring or a ridge at the top of the ring travel, about a quarter of an inch below the deck. If the bores are clean, and if they still show the original hone pattern, you may luck out and just be able to buy rings, bearings and seals, and have a machinist hone it up for you.
If you do that, have the machinist check the crank to see how it's wearing! If need be, he can take a little off the crank too, and then you get thicker bearings to compensate. You don't want to skip that step and then end up with low oil pressure from excessive clearance.
