Thanks. My issue is header fitment, If an RB block with standard heads would be similiar to and 400 block with the Indy 440-1 heads, in regards to port location. I have a very tight fit with an RB and Eddy heads. Basically being cheap and lazy, and trying to figure a way around building another set of headers, while upgrading heads. I dont have short block yet, so looking at going either way, I'd go low deck with Indy if that would work.