Engine swap on a 80 Chevy monza

[Creepingmonza]

I have a 1980 Chevy monza with a 151 iron Duke under the hood.I'm wanting to swap it for a mercruiser 3.0, prefibly an older one like a 79, but in new condition. Reason is I am dealing with 70-76 hp,and new this block put out 82 hp.40 years ago this was a quick car for mom to put put to the store but now its struggling to keep up.I also have a squal I can't find,I think it's in the crank.maby a spun bearing.not sure.I'm aware the mercruiser will double my hp and sence its the same block with a stroker kit and a super duty crank,it should drop right in and I won't have to mod my suspension like I would with the more popular 350 h body conversion.I need any and all info here.can give it to me here,in me,or email me at creeper0629@gmail. Com.I'm aware the merc was converted for Marine use and I'll need to know how to convert it back.if it helps I have my intake on the passenger side, Rochester verajet 2 carb.not happy with the carb,and would like an upgrade here.thanks

[Creepingmonza]

As a note I'm well aware my car is a Chevy,but its engine is relevant to the site,and many here should have knowlage on the engine.

[eaglefreek]

I cleaned up the thread to keep it on track. I wish I could help, but I don't know anything about the Iron Duke.

[carnuck]

There are 2 Dukes. Early one has SBC and 4.3L V6 bell pattern. Later one has 60 degree Chev V6 pattern like the 2.8L. Aside from that, they are very different.

[Creepingmonza]

Sorry I been mia for a bit,I was trying to finish a crossbow I am working on for a survival forum that wanted to do a full post on my project.I wasn't aware the Duke was also a six banger.interesting.I'll do research on that

[Creepingmonza]

And thanks for taking out the trash on this thread.I'm sorry you had to deal with that.wasn't what I wanted.I still have no leads on the motor,but plans got derailed as some things came up.but I got time to research this further and I hope y'all can help.I'm shooting for the mercruiser 3.0,I think my big challang will be converting it back to automotive use.if it realy is a Duke they slaped a stroker kit in I have no doubt bell housing will match and at most I may have to tweek the engine mount a tad.I'm curious if I get one with more modern intake and fuel systems if I will have to get rid of my mechanical fuel pump.I realy like that thing and would want to keep it.