Hi,Has anyone had an experience with the costs related to replacing an old octopus (gravity) furnace with a newer forced air furnace?

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Should I replace my gravity furnace from 1952 for my rental property located in Minnesota?

I see an inevitable gravity towards areas with both better weather and prices.

You can use the free one provided by Podio or ign up for Gravity forms if you want to doll it up.

If nothing else, mixing your concrete yourself on a platform and then letting it gravity feed into and through your holes with a self made mason's pouch (much larger, perhaps made out of canvas or heavy mil contractor's bags)One way or another though after filling your block, or possibly re-laying as Matthew alluded to, you'll want to properly attach the structure and walls to your new solid block wall. 

& in New York we have the dreaded Scaffold Law that has ruined many businesses & home owners.....take adequate precautions.The Scaffold Law, enacted in 1885 as Labor Law 240, places almost absolute liability on contractors and property owners for gravity-related accidents at construction sites, even when the workers are at fault in part or whole.

And some markets, like Boulder where I am defy gravity and are still moving very close if not at list price, U/C within 30 days. 

Gravity forces water to travel down the building and it destroys anything in its way.

Your sump crock is lower than all of these, which by gravity draws the water into it and out through the pump.