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1985 YZ80, "Bogging" hard at WOT

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Bike was the first bike I ever rebuilt, I really think the head may be warped. I cant tell if it is getting combustion gases into the rad or not. I bored and replace all top end, maybe have 5 hours on the bike. Whats developed  after a few times  out and riding is now the bike at full throttle literally acts like its missing. Vroomblah vroomblah vroomblah revs up and rpms go to zero for a second over and over and over If I cut the fuel off most of the time it will run great for a few minutes then run out of gas so I am thinking its getting loaded with fuel. Any ideas? Also any tips for testing to make sure no gases are getting into cooling system? Thanks in advance.

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