What size engine for the online/Youtube EC?

I may be in depending upon when the deadline to have the build and dyno done is.

I am building a 340 soon anyways. I have no expectation of being a contender against the pros on the board, but would like to dyno the engine anyways.

Maybe do a back to back test between edelbrock magnum heads v/s EQ heads with the rest of the build remaining the same. I am assuming the edelbrock magnum style heads would be allowed since they are still currently available new.