myisuzuparts is back up. Here is the part number info and crossover for a short block
TROOPER....ENGINE ASM; PARTIAL....5-87310-451-0....08-1997 to 07-1999....6VE1....DOHC ENG
VEHICROSS....ENGINE ASM; PARTIAL....5-87310-451-0....12-1998 and later....6VE1....DOHC ENG
The heads are all the same on all the Isuzu SUV's (3.2 and 3.5) from '98 thru '01. So a long block for vx or trooper for the years above would be no problem. Newer trooper 3.5's probably also will work just fine. They just have a different part number so they may have changed one little thing on them. Jerry would know for sure.