4346 carb questions
 

Did 4346's come with the internal brass fuel filter, gasket, and spring in each inlet port?
Does the fuel line Y-block bolt to an intake bolt via a bracket or is it just hanging out, supported by the fuel lines on a 1969 L72 427?

1st question - yes
2nd question - by the time your car was made it had a bracket as part of the fuel block. It was crimped onto the bottom of the fuel block and made out of stamped steel. The intake used a stud in place of a regular intake bolt that the bracket was affixed to and secured with a nut and lock washer. Early cars, prior to (guessing) Feb. 69, did not have the bracket and the block just hung there supported by the fuel lines.

Thanks Bentley!