Gasket blew at track

[USMC302]

OMG, it ran sooooooo good and smooth, even the idle surge went away, man after a little tuning it came alive.

Here is the new deal, went to hometown this past weekend, drunk stepdad, took keys for joke and decided to do a burnout without my concent, long story short, he bounced off the rev limiter a little too long and collapsed some lifters and possibly bent some valves. All plugs are black with smut and gas and it runs like sh*t now. Pulling it apart tonight to test the valves.

Question? Do you think the over revving caused it ultimately or could I possibly have an issue with too long of pushrods, they are custom length with the heads and roller rockers.