Originally Posted by JW51
. . . .

Will the GMC inline 6s bolt into a Chevy without mods?

I'm guessing not, since I've not read about it here.

http://www.stovebolt.com/techtips/engine_swap2_302.htm

I think these two are the same:
http://www.langdonsstovebolt.com/tech/engine-swaps-to-better-sixes/
http://www.inliners.org/tech/tech1.html

http://www.chevytrucks.org/tech/gmc302.htm