Stock 86 350 wheels and tires to 93 300

farmer , he said the rear will work fine -------just the front would need spacers or a different rim --------- I don't know 350's , is the front rim sizes of your 350 and 300 the same , where you could swop the tires from one rim to the other ? ------- wheel spacers sound easier

https://www.ebay.com/itm/ECCPP-Whee...ash=item2a8a4ccedb:g:VjEAAOSw5Ktac0~y&vxp=mtr

those are from Canada , just a reference

that is a good question about the front to back widths being the same ----what I do when measuring up for spacers , jack the bike up where I can get the tire off right at the ground , put the new tire/ rim where it needs to go without bolting them up and measure the distance from the rim to the hub ------ those tires should swop rims no problems , both are 11 inch rims , one inch width difference won't be a problem , you can run 25's in the front of a 300 with no problems so 24's will fit