Well don't be surprised if that 950 cfm don't work fine as is. A 950 is really about a 850 with a 750 main body. It does't flow no where near 950 cfm. I had a 454 ci bored .030, KB domed pistons, ported factory oval port heads, about 11:1 compression, crower mechanical roller cam: 641/636 lift and 252/262 duration, Edelbrock Victor jr with a Holley pro series 850 cfm. I rejetted it up 1 size front and back but had to go back to factory size on the front. This was in a 67 Camaro with an 400 auto, W/3600 stall and 4.11 rear. I have recently rebuilt that motor to a stroker 491 ci. I modified the carb with a perform billet base plate and main body. I haven't installed it yet, still getting the body ready to paint. The 950 is supposed to give a better signal for throttle responce than a 850 does. It all depends on the rest of your setup. I think it is a good choice. Good Luck!