8 bolt small block crankshaft

OK here are the numbers:
P3690905 340 Engine Forged 8bolt flange
P3690945 355 Engine Forged 8bolt flange
2843885 318-3 Forged, Hardened Crank, 3.31-inch stroke

It does not say if the truck crank is an 8 bolt or not and I cannot tell by looking at the picture of it so I may have heard that info from somewhere way back in the deep recesses of my brain.....haha. would be interesting to actually find one of those truck cranks. I have a feeling they were in polysphere engines.