Sounds like you gotta machine the crank or replace it anyway. Do a 383 in that case. Would be a fun build. Glad you figured out the right bore. 4.30. Not workin in any old small block I know of. Lol
The dirty 30 of busch light may have had something to do with the missing zero in my first post lol. I had just always thought it was a 305 so we were very confused lol