My experience swapping from ported iron heads and a hft cam to a well setup ported aluminum head/ hyd roller cam package was literally a mind and a tire exploding experience.
Your first option is probably the best idea..but ditch the exhaust manifolds. The only thing i would change is possibly the cam? I don't know the exact specs of your cam..but to truly utilize the added flow of the new heads..you will want to have a high gross valve lift. In the .650 range or higher. The torker 2 will get the job done but it will need some plenum and runner work.
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466 Mike Voycey shortblock, 310cfm SD KRE heads, SD "OF 2.0 cam", torker 2
373 gears 3200 Continental Convertor
best et 10.679/127.5/1.533 60ft
308 gears best et 10.76/125.64/1.5471
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