The 307 has dedicated knobs on it for heading and altitude, the 305 doesn't. I'd gladly trade you my 305 for a 307 plus cash, if you decide on a 305. The 305 is not quite as tall, which might make a difference on an RV-8 panel.
Ed
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RV-9A at KSAV (Savannah, GA; dual G3X Touch with autopilot, GTN650, GTX330ES, GDL52 ADSB-In)
Previously RV-4, RV-8, RV-8A, AirCam, Cessna 175
ATP CFII PhD, so I have no excuses when I screw up
2020 dues slightly overpaid
Retired - "They used to pay me to be good, now I'm good for nothing."
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