All depends on how much power you want to make and how high you are going to run the engine. The 270 heads with a matching MW intake would be a pretty good street combo with a 540 inch shortblock. Might run out of steam at 6500 rpm or so at the track. But, unless you used high dollar parts you probably don't want to spin a 540 much past 6500 rpm anyway. Especially if it is a stock block. You didn't really provide enough info to answer the question so I'll say it just depends.