Ok, so you found the correct tables in Annex H, even though I accidentally misdirected you to Annex I. Sorry about that, 2010 - 2015 versions mix up...
If your CE is higher than in table H1, you'll have to find the info you need elsewhere. Perhaps another forum respondent whom has had direct experience with this exact combination will reply with better help.
My opinion is that you'll wind up with min preheat around 450F, max interpass around 650F, followed by an involved slow cooling procedure. Whichever parameters that you select will need to be validated through testing.
As for the filler metal, low hydrogen is a must. Strength matching either the stronger or weaker base metal is acceptable. (see note 1. in Table 3.2). I would use the lower matching ER70S to help reduce cracking potential.

Tim

The material selection should be reconsidered. The carbon content is rather high for ease of welding. As already mentioned, low hydrogen practices, high preheat, high interpass temperature, and controlled cooling are a must.

To comply with AWS D1.1, the welding procedure must be qualified by testing. The materials in this case would have to be the same as that being welded in production. In short, the cast node would have to be used when the WPS is qualified.

I would be concerned about using any material coming out of China. At issue is the control of the chemistry of the cast steel nodes, specifically the carbon, sulfur, and phosphorus content. Some reputations are hard earned and there is ample reason to proceed with caution.

Best regards - Al