Well got my boat on the water finally this year. Runs great off idle. I was pushing right around 5 grand on moderate water and that boat is fast. Estimating at least 65-70 mh. Ok so now I have the biggest problem. I have a vacuum leak. I'm pretty sure I have one on the back carb. Couldn't get it to idle no matter what I did. After much frustration trying to set the idle I just bumped the idle up so far that it was dribbling fuel out the primary's to keep it running. I know probably wasn't a good thing but I was trying to salvage my day. I have dual edelbrock 1405 carbs. Using a can of brake cleaner I'm pretty sure that where the top half of the carb meets the bottom half has the vacuum leak. Tightened it down and it helped a little bit still there. Does anybody have any tips for me? This can't be that hard to set. I mean I have set dual carbs before on vw's and had good success.

id try pulling the carbs off, cleaning all the old gasket off and try new gaskets.   its cheap.  do you have to run multiple gaskets and deal with sandwiching a throttle plate inbetween the carb and intake?  i silicone my throttle plate to the intake and then use a carb gasket between plate and carb.

No I don't have any problem with sandwiching. I will try a new gasket for sure. I did rebuild the front carb and should have done the back carb. Ill try that thanks.

Spray starter fluid around the car and when it idles up you found your leak

Inspect insides of carbs could have some shit in there. Todays gas sucks ass, good luck.

Give it a good blow job in every orfice with compressed air. take the top off carbs. check needle and seat for propper operation.

I can not see a cam causing your problem something is not set right in your carb like the floats

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