Overall overlap, or lobe center understanding?? ¿.

I've seen this happen a lot. Especially when I was younger. I remember a kid I went to school with showed up one day with a really radical sounding mid 70's Camaro. He popped the hood to reveal a 307 with it's original dinky 2 barrel. It had the same cam as your buddy's car, the 350 hp 327 cam. Sounded mean, wouldn't outrun a kids bicycle in a block.