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okay (sorry I'm a young newbie dumdum)

so the most important first step is the relationship between cylinder dimensions and plug reach...i get it.
And then I'm home free from there by fine tuning...

by factory, you mean the factory plugs that were recommended for the FI application? Is it correct to use the same plugs for a carburetor application?

all components are "factory" except bigger valves on the heads

What spark plugs do I need...plz help. Small Block Chevy '99 suburban block, stock 350cid configuration ZZ4 Corvette heads 2.02/1.60 valves

Cam specs: Cam Style Hydraulic roller Basic Operating...