You could ohm the caps, don't have the value in front of me ,it's in the Clymers. If you replace them use NGK, cut 1/4 inch off wire before install. X-2 on leakdown. Did you talk to your builder/porter about your set-up you're running? I don't know a lot about different set-ups but IIRC, T-6s are for stock cyl, and single carb are mostly for trail set-up at best. With drag porting you might not have a strong enough signal at low rpms and not enough carb for high rpms , along with the pipes choking it. JMHO, your results may and will vary.