Sorry, missed the topic title.
You should find out what the carb came from.
P.N. ?
Then find out what size metering rods & jets originally came with.
I never had too much luck when using a spreadbore quadrajet for performance,but then again I did not send it or take it to someone who could set it up properly for my L6.
Is it a squarebore or spreadbore carb?
Are you absolutley sure you want to use that carb?
Just asking.
MBHD