i have used the proform bodies on a holley with good results.
dp4150 750 cfm holley i installed the proform body which made it a 850 cfm and it worked really good
i replaced it with a dp4150 850 cfm holley and then later installed the proform body suppose to flow 990 cfm i will find out as my carb is out getting flow tested...i know not the answer u want as u want the whole carb but what i have used it worked good