07gmt800rcsb

new to this site. been looking everywhere.what i have is a 2007 gmc 1500 classic rcsb. truck was originally a v6/60e dbc. i have swapped in a 6.0 and 80e dbc. the engine harness is from a 2000 6.0 chevy. problem is the harness will plug in to the fuse block that came in the 07 gmc. but the layout of the 07 fuse block is different from the 00-02 fuse blocks. right now if i hook everything up as soon as the battery is connected the starter will stay engaged. so what should i do? any help would be greatly appreciated. should i keep the harness and re-pin for the 07 fuse block? or use a 00-02 fuse block and re-pin the c3 and c4, or get a 03 and up harness. thanks.