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The only things that changed were blocks after 1987 having the lugs on the center ridge for the spider for the roller lifter set up. Which isn't that important since they can easily be machined in when the block is cleaned up or you can do it yourself after you get the bare block back from the machine shop with a drill and tap set and a small spacer.
As for the intake bolting up, that has to do with the intake bolt pattern on the heads. Any gen1 SBC head can bolt to any gen1 SBC block, so all you really need to do is pick heads and intake that match one another.
The only other thing that changed was the rear main seal. They went from 2 piece to 1 piece, nothing that makes a massive difference. Both of which you would change anyway if you built a motor
The top end of stock TPI stuff is the same between the 305 and 350, all GM changed was the pph of the injectors and the chip in the computer.
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