Carb Selection

I have a 408 built on a 92 Magnum block. My cam is 242/248 Dur@ .050, .3660/.3630 lift @ .050, 112° lobe sep. 549/544 gross valve lift. Pretty close to yours. I run an RPM air gap and my compression is 11.8:1. I ran an Edelbrock 800 for a year and had no issues, other than a rich condition which was likely timing rather than carb. I am (still) planning for an E85 conversion at some point, and since they run on Proform bodies, I changed to a Holley 750dp so I could get all the plumbing in place. The Holley has more power but needs a lot of adjusting and tinkering. It also runs rich, but again, that will be in the timing. I need to **** or get off the pot and either get a programmable MSD box, an E-curve distributor, or bushings for my existing MSD distributor. The 750 is more than enough for your motor. Mine turns 500hp and there is plenty of fuel. I recommend talking to Crackedback about how to set up the timing correctly. You will love this motor. Every time I drive it I can't help but smile and say "Holy **** this thing is fast!"