I have a 454 Mark IV BBC not sure what heads with B&M 174 with small pulley 5 PSI boost a carb from a HP 500 motor. Electric choke is not hooked up. My dilema is getting a good idle that will prevent boat from stalling out in gear. 1100 RPM in neutral delivers 550 to 600 RPM in forward gear with Bravo 1.5 to 1 gears and 27P mirage. Boat is 1989 230 Velocity with zero efforts separate shifter and throttle levers. Trying to eliminate the kerthunk from 1100 RPM engagement. Motor will idle less with adjustment screw but die out in gear. Separate controls make slapping in gear and then providing enough throttle to prevent stall a challenge. Is 1100 RPM too much for cone clutch? I had a guy suggest blip of throttle then watch tach drop to 400 Rpm and drop in gear. Some what a pain in the arse and speed wont drop unless you turn down idle equates to stumbles at dock or trailering. Should I mess with idle mixture. Boat is jetted fine right now and runs like a banshi. Dyno 552 HP 5600 RPM. Prior to the HP 500 carb which is a Holley 830 or 800, I believe, Boat had a 850 Holley carburator similar problems with idle but less throttle response and tired floats and needle seats from years of sitting. Engine has 35 hours since it was built to handle the blower all polished and ported carb that came with built engine was not marine version and had to pull it for obvious reasons.
Anybody ever deal with this type issue before and find a workable solution? Or is this something you just live with?