For the OP the difference between his generic one inch open spacer that he has and any other one inch spacer is minimal horsepower. The big gain is putting a one inch spacer on that Torker 2. 20 hp my estimate for minimal investment.
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466 Mike Voycey shortblock, 310cfm SD KRE heads, SD "OF 2.0 cam", torker 2,generic one inch open spacer
373 gears 3200 Continental Convertor
best et 10.679/127.5/1.533 60ft
308 gears best et 10.76/125.64/1.5471
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