SB Push Rod Length
Measure if your swapping parts around.... I have a MP short block with Edlebrock heads, .063 head gasket, Comp Cam, and Crane 1:5 roller rockers and I needed a 7.00" push rod for my combo!
BTW: Make sure your valve springs are NOT going to bind at full lift. My first motor ate itself in 20 miles due to screwed up valve train geometery. A $3,000 mistake.