As for the airflow question... ultimate potential is not a concern for me. I'm building this car for daily driving, long distance (possibly very long distance) trips, reliability and just fun. I sold all my 600HP 400 lowdeck stuff and really... i would have no use for such a thing. I'm building a car i can drive and play with ALL the time... not something i take out only on sunny summer weekends with a support vehicle. 350-400HP would be more than fine in this 3100-3200lb car, and down the road squeezing another 50-75HP from the combo shouldn't be a big deal. It'd be nice to have 500+HP, but then i'm using a lot more gas...

The 450HP 360 Magnum build in that link with the Edelbrock heads was intriguing... That'd be perfect... or maybe even a similar combo on the 318 Magnum...