It's better to build an engine from the beginning with boost in mind rather than start with a naturally aspirated engine and try and convert it, as you usually end up throwing stuff away or making lots of compromises.
Several things really need changing for a boosted application to be the most reliable and get the most power:
SC or turbo specific cam grind
piston coatings & compression ratio
piston clearance (going a little bit more on the bore, say .0005" additional, for boost and increased combustion chamber temps & piston temps isn't a bad idea)
wider ring gaps
inconel exhaust valves
headwork (especially on the exhaust side but don't neglect the intakes)
head gasket selection (MLS is very good)
Also, the ZZ502 heads aren't too hot especially on the exhaust side, I'd recommend something like Canfields or AFR's.
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1969 Chevelle
Old setup: Procharged/intercooled/EFI 353 SBC, TKO, ATS/SPC/Global West suspension, C6 brakes & hydroboost.
In progress: LS2, 3.0 Whipple, T56 Magnum, torque arm & watts link, Wilwood Aero6/4 brakes, Mk60 ABS, Vaporworx, floater 9" rear, etc.
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