You'll need to decide what route to take. All I can do is relate my experiences with a 6-71 on Pontiac V8s, mostly the M/T hemi. First off, two keys aren't needed for a 6-71. My hemi (370 c.i.) made 900 HP (sometimes to 9,000 RPM) for eleven seasons using just a single 3/16" key. I always used one full-length key to drive both the timing gear and the blower hub, to reduce stress-risers at ends of the keys.
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Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons?
... or has built a record breaking DOHC hemi four cylinder Pontiac?
... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967)
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