The standard speed will be way too fast for metal cutting. To slow a wood cutting bandsaw sufficiently for metal cutting requires a double reduction using a countershaft and 2 pairs of belts and pulleys, so it isn't a simple matter of changing a drive pulley and a belt.
I've got one of the old Boice Crane saws and have considered using one of the servo motors now available to retrofit on industrial sewing machines. A quality 550 watt (about 3/4 HP) motor with programmable control is about $200, and the max speed can be programmed for anything from a crawl to speeds sufficient for wood cutting so the wood cutting functionality isn't lost as it is with a countershaft speed reduction setup where you're limited to a single slow speed. I installed a Reliable Sew Quiet 6000SM servo on my Consew walking foot machine and would use the same to repower the bandsaw. By the time you buy pulleys, belts, pillow blocks, etc for a countershaft rig you're over halfway to the price of the servo motor and still have a fair bit of fab work to do and still end up with far less functionality.