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I think its partially due to age and use.

Some trucks spool right up and some seem to have more lag. The trucks that have reman or newer engines have a noticeably faster spool.

Marine is usually cold water cooled you can really push them in that situation. Unless you are really working your lmtv it dosnt need more power than the cat dealer can safely eek out of it. You increase the probability of something breaking. I have seen a lot of driveshaft and related...

I thought the 3116 top road hp was 290 and 330 for the 3126. Thought the higher hp numbers were only marine applications with cold water cooling.

I would start by changing both fuel filters and adjust the throttle cable. Sometimes the gas pedal is bent, you can bend it back and reinforce it with a metal strip or it will just bend again. Look in your fuel tank with a flashlight if it has old brown fuel or lots of sludge flush it out...

3126 in 6x6 is 330hp same as C7. I believe the C7 has room to increase power I dont have any experience with it though.

Try driving an older deuce or even a m939 truck unless it's an A1 with the fuel turned up the Lmtv will run circles around all the older mil trucks. Unless you are pulling a really heavy load the Lmtv is geared low 290hp is a lot of power. Around town I keep up with traffic in my 230hp 1994 m1078.

C7 can be bumped via computer. The 3116 is all mechanical.

290hp is the top rating for the 3116. You can have an Indy shop tune for more but at the risk of shorter engine life.