Got an old Offenhauser tunnel ram for a 440 with max wedge ports. Would I be right in thinking it will bolt up to Indy EZ heads on a 400 block?

Not on a 400 block - the ez's end up with the same intake port locations as stock it would work fine with a RB block - I run a MW crossram with EZ's on a RB only difference is it sits about 5/8 " off the block - but the indy valley pan plate works fine under the intake

Thanks, I was hoping the Indy ports were raised the same as a stage 6 head, I know you can use a 440 intake with those.

yes the Stage 6 heads would work just fine on the 400 b motor - if you think about getting rid of the intake I would be interested - you don't see many offy intakes