They don’t make better heads for the inline six,
And Joe pointed out the down side of messing with em

It has got me wondering if the 4.3 v6 that Chevy used in the 2012 Silverado would fit
It’s basically the v8 with 2 cylinders chopped off, if the pan doesn’t hit the axle or crossmember
You could slide it about 4 inches forward.
It makes more than enough power