Broken rocker arm and push rod ?

New 383 stroker motor just put in and did the cam break in changed the oil and filter started up fine took it down the road not running it hard it ran fine for a minute then stopped at stop sign and took off easy and started missing so i changed spark plugs and started it up and it was knocking so pulled of valve cover and had broken rocker arm and push rod on cyl 7 and the other rocker was turned sideways any help would be appreciated thanks