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I'm being conservative in my estimation....
given the published flow data I've seen on RHS's and eddies, I'd think they'd be pretty close power wise, maybe 10hp more with the RHS's...but they'd also be 50+ lbs heavier.
So with a .557 cam do you still think I will get 17+ mpg? that'd be great! I like th idea of a tight convertor, too. I like those RHS heads but like you said..an added 50lbs...so I would want the eddies for sure. Anyhow, I will looking for the magnum motors now. Hopfully i can find one in a junk yard around here with low miles. 
what .557" lift cam? lift is meaningless in powerband discussion. duration is the important figure, especially advertised and .050 duration, and possibly something like .2" duration.
a .557" MP solid probably not, since it's a big cam duration wise. a .557" hydaulic roller with ~218 degrees of .050 dur, probably.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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