Hi Ken, Don't cut just yet. First take some measurements of the casting and jot them down, they are actual to the part and period. Second, if you can, make a "jig" from wood and bondo and secure the casting (wax it first) to the wet bondo and wood. This will give you a fixture to epoxy the casting back together filling "just" the saw lines. Castings are like a solid print, exterior first and interior second. You are going from iron to bronze so the shrink will be different and measurements will be critical. I did a "Thomasnet" search and didn't find any bronze foundries in your area. Yo