Need big block help

PRH said

440 and 400 blocks are different deck heights.
If not using Stage 6 heads(which apparently you’re not), then which intake manifold is on the engine will tell the tale as to whether or not the block is a “RB”(tall deck), or “B” (low deck).

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So just to finish the info on this mega block engine. It isn't a siamese block which is good for us. I dont know if the pics of the dual plane manifold are good enough but it is a Indy piece. (I just looked back at my original post mistake where I said it had AFR heads instead of Indy, My Bad).The car has a 3500 converter which is something I would change by looking at the dyno sheet and I like it as a convertible cruiser not a race car.
Thanks for every bodies input.