Waaay too RICH - Need Advice

First big weekend out with the Chappy I bought this winter and noticed a few things.

-Starts pretty easy when cold, but has a very strong gas smell until fully warm. Slight white smoke haze as well coming from exhaust.

- Once warm its a PITA to start again. Usually have to hold it wide open and crank for 10+ seconds.

- We just bought a place on a lake which it will be used 90% percent of the time which is at 2500'. The boat was purchased in Seattle so I assume its been setup for sea level.

My buddy who is more mechanically inclined thinks its just jetted too rich. I'm decent with a wrench, but clueless when it comes to carb adjustments. Is there a standard jet kit that I should be looking for? I'm not trying to eek every MPH out it it, I just want it to start easily and get decent economy without sacrificing reliability. If it makes a difference, the other lake we live by is at 1600' and would only see a few trips out on a season.

My local marine mechanic would only have access to the 1600' lake for multiple trial and error runs, so I'd like to get this as close as possible so when I moor it in a couple weeks I won't have to deal with it again. Or am I better off finding a mechanic who can take it out for an afternoon up at our vacation place to tinker with it?

Stock '95 454 Carb.