The casting is normal in the block. You get any 86-87 block and they are round and smooth. As far as teh rope seals, you can use chevy style neoprene and throw those stupid ropes in the garbage. The any turbo buick v6 doesn't cost a ton to mod if you are creative and spend your money in the right places. IF you have a good block to start with, you probably won't have much more than 500 bucks into the rebuild, and that's for the turbo kit. There's stock longblock draw thru cars (79-83) running Stock 87 GN times. A stock 350 isn't going to run that. I see so many small blocks under hoods of cars a car show I won't even look twice at the motor and if someone starts talking about how great there 350 is most of the time I fade it out. It's your choice to follow the flock, just don't kill such a rare car.