88-98 stepside box on 68-72 frame how to

[1972BackInBlackC10]

does anyone have info on what needs to be done to make this work? or a link to someone who has done this swap?

i can get one f these boxes fairly chea and probably wont be able to afford the proper fleetside for some time so i want to go this rout for time being so i can drive my truck, if it involves hacking up my factory mounting points on the frame for the original box im not really interested in doing it, if i only have to drill a gole or two in the frame thats not as big of a deal

any info would help thanks in advance