383 question

I built a twin to that about 10 years ago. The block was blueprinted for zero deck (which on a 383 is critical...) and the heads milled. It was 9.8:1, XE268, Street Dominator, and 3310 750 VS Holley. Small tube headers. It makesabout 420hp on pump swill.
It's a good combination if it was done properly. BTW, that Demon carb is about the same as the typical 4150/3310 Holley 750s. If it were flowed and rated the same way it would be very close to 750cfm. I'm not a fan of Demons but it if it's working for you keep it.