You would do good if you could get $150 for a bone stock magnum head.

A cheap way to make gobs of power would be to have Ryan J or some one put a good port job on them plus a set of the mopar .600 lift springs. They would be cheaper than eddys and make more power. The only advantage would be the weight differance but the extra 50 hp from fully ported mags would easily handle the 50 lbs weight saveings from the untouched eddys. The only down side to going this rout is you will be at the limit with the mags but the eddys could get ported more down the road. Magnum heads are the shiznaz for budjet hp!

If you only want 425hp then you can almost do it with no porting at all on them