5.7 Carb'd Swap on a Reasonable Budget?

Kinda late getting into this mod Hemi thing, but when I bought my 300s 5.7L, and LOVED it, it got me thinking about a daily-driver swap into an older chassis. I have a complete (less wiring and belt-powered accessories) 2005 truck 5.7 (rear sump pan) from a mis-diagnosed truck at a nearby shop (needed a fuel pump, the shop condemned the motor and swapped it first!) that the owner swore was running mint. I have already repaired a 2005 Magnum R/T that dropped a valve seat, so I'm aware of that Achilles heel. My thoughts are what I've done in the past with good results: deglaze and re-ring with new bearings and fresh heads and cam/intake/exhaust upgrades. I see a dual plane carb'd intake is available (OCP?) and I already caught the HEMI6 MSD box and harness on sale at Summit. The truck Hemi manifolds suck but I see SRT shortys on Ebay occasionally and pass-car cast manifolds everywhere pretty cheap, so with my 400hp-ish flywheel HP goal, those might work. My questions are: at this level, would I be safe just installing upgraded-seat early heads or should I spring for Eagle heads? If I took the cheapest route here I could possibly justify a piston upgrade, and if so, what is the best choice for a little more compression and valve relief for a non-stroker? Being a traditional V-8 rodder, I want a tighter LSA cam for the sound and torque production with a 750ish CFM carb. I'm thinking a little less than 230*@.050" intake duration and 110*LSA or less. Thoughts?