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I've been running the Holley spread bore (#4175) for 3 years without any trouble. I did have to change the discharge nozzle and actuator cam when I first put it on. They send the instructions with the carb. The tapped hole for the Brake booster is small so I had to use an adapter and my stock 73 air cleaner needed a 1/2" spacer on top of the carb. 
But it runs good
But it runs good
Brian - NCM Lifetime Member
73 coupe L48, Flat-top pistons, Performer RPM Heads, Crane Cam and roller rockers, Holley 650 vac sec. Performer intake,
3.55 gear BTO 200-4R trans,
Leather seats, Seatbelt Plus 3point seatbelts, Pioneer CD player
Magnaflow Exhuast System
Dewitt radiator and dual electric fans
Borgeson Steering box
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in Forum: C3 HVAC, Fuel, Emissions, and Exhaust
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