Dave, The 1850 Holley IS a 600cfm carb, they were inexpensive in the day but a great carb none the less.
I am seeing the GREAT, Vintage Edelbrock F4B intake-again a GREAT intake and many used them back in the day (including me) because they perform and look like the Shelby intake-VERY COOL PIECE!!-I think for what you are doing with your car that you could use it-just paint it black and put an Autolite 4100 Hipo "clone" on it & you'll be good to go!!
I think that BIG, NICE 9" rear can handle the power!! (lol)