I've used the stock Mopar OEM manifolds on many hemi strokers with Eddy 600 and the larger 750 CFM carbs. by drilling the AFB pattern into the Eddy bases The Eddy smog carbs with the electric chokes don't make as much power on the dyno as the Hi Po with mechanical chokes do If you deicde to use the 750 CFM carbs, either sets, you will need to enlarge the front holes on the intake also I used the Eddy progressive linkage on them also One to one linkage works great on them on the street also Your choice, let us know what you do