Whats the difference ? 4150 question !

Hey a-buddies I have a question about holley 4150s.
I'll start with the statement, on the 830-850-1000 cfm classic hp holley the venturies are identical at 1.561 (or somewhere around there) however the 830 uses a similar sized throttle plate & 850-1000 use a 1.750 throttle plate. (950 too but not in this equation)
The question is, what's the difference between the 850 & 1000 if their physically the same & with a bit of grinder work can I get my 830 to have a 1.75 plate & copy the jets, squiters, air bleeds & boosters to achieve a 1000 cfm.
I'm sure many of you smart folks have tried, we're you successful ?