383 Manifold casting numbers

How about casting numbers 2806900 and 2806974. I think these are 1968 HP 440 manifolds. Would they bolt up to the 1970 906 heads on my 383 plus give clearance for power steering pump in 68 Dart? Will have Shumacher mounts to convert six to eight and would like to avoid headers if possible for factory look. Hyperlink above shows this to work but want to make sure these manifolds will bolt up. I think yes because of same heads, but need advice.View attachment $T2eC16R,!ysE9sy0iIGeBR(lEtoFh!~~60_57.jpg

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