Should I pulley up and run more boost

4-5 lbs boost at 4000 feet, is prob like 2-3lbs of boost at sea level.

I would get an o2 sensor installed, and get fuel dialed in. See how it runs. Id order some new pulleys, and get the boost up.

You prob have 100hp or more on the table.

I dont think adding msd is gonna do much for you.

Nothing will kill a s/c engine faster than running it lean. Make sure the fuel tune is right, before turning up the boost.

Whats the fuel system setup? Pickup, line size, filter , pump, etc ?

I'm not running lean probly a little rich plugs have a dark shade to them also back of transom has a haze on back from exhaust where do I put a 02 sensor so it won't get wet? Wiband would be so great I'll shoot u a pick of motor and exhaust tomorrow thanks buddy appreciate all your knowledge and help

2 750 holleys electric fuel pump about 7-8 pounds fuel pressure

I ran it at havasu last yr what a difference in power. WOW and I jetted up for there

What exhaust are you running ?

Mercury used to sell "high altitude " pulleys for the sc engines for this reason

Measure your pulleys you have now as precise as possible, and i could tell you what youll want to order

you cannot tell much anymore by reading plugs(I know some wont agree) again, without a wideband, you can be rich one area lean in another, only way to get any info is brand new plugs, WOT pass, shut down, ck with a reader, even then they can fool you..

I believe there lightning in gonna take some pics today and I Will post them

I believe exhaust are lightning I will take some pics today