RE: MSD spark plug wires.
I ran Autolite 764 C (coppers) in my 750HP ProCharged Cobra.
And I'm running Autolite 764 Cs in my Mark VIII. If that gives you a clue.
MSD is geat the street cars. The measured resistance vs. stock wires is very low (stock=8,000-20,000 ohms, MSD=50-400 ohms). Less resistance = more wattage (more power) required to "jump the gap" (or overcome the resistance of the gap). We run MSD wires and coils on a 98 Cobra putting down 530rwhp.
My Cobra's wires? I went with a StreetWires setup with Demon coil packs. After that adventure, the MSD coils aren't any different then I can tell. The wires are though.
Fyi, I ran the STOCK coils and STOCK wires on my stock Cobra with 22psi of boost for about 15k miles (oil ring finally broke, started eating oil, still ran great though). And the part number of the Mark VIII coils match the Cobra coils.
Technically, the stock coils are just fine with some good wires.
Oh and I ran a gap of 0.055" on the Cobra, and am running that gap on my Mark8 (with Navi cams).
Eric