steering box woes

I've got a 74 dart sport, and I'm attempting to swap from power to manual steering. My problem is I can't get the pitman arm loose to swap units. It won't budge from the drag link or the sector shaft. I ruined a pitman arm puller Trying to remove it. I'm not really going to have the room for the power unit with headers and a hemidenny unit is nnowhere near the budget..... (which I'm way over right now!) thanks for the help