The bolt pattern on some 6cyls are the same, some are different. See the link.
https://en.wikipedia.org/wiki/List_of_G ... V8_pattern
They are really easy to spot though.
_________________
My '80 progress thread - hugger orange!
Now with LQ9 power - forged pistons, LS2 rods, 236/242, .621/.612, flowed and milled 317 heads. MS3X
4L80e, 12 bolt, 4.11, Moroso brute strength posi, steel shafts.
Subframe connectors, g-braces, solid body bushes, carbon hood and front bumper, custom door cards, Autometer gauges.