I've got a Volvo 8.1 with carb and intake no efi I've got all mercury cooling " pump oil cooler power steering cooler and mercury headers closed headers. Any info on how to make this all work together

Not a whole lot different than a Merc set-up. Volvo base engine is GM, just like Merc.

If you have some hours on the current engine running raw water I wouldn't recommend putting closed cooling on it.

you have a carbed 8.1

Volvo nor Merc never made a carbed 8.1 ever. So is this a conversion MPI take off to carb app now ?

Yes dart makes s intake for 8.1 carburetor

the list is getting shorter still looking for parts looking for the whole front of engine alt bracket/power steering/cross over tube/etc
thanks guys for all the help