I'm not sure. The people at Six Flags would be able to answer your question better.
I'm work at six flag and yes he can get on some of the rides
Due to the restraint system, the Skyscreamer and La Vibora would probably work, while Texas Giant definitely wouldn't (speaking from personal experience). The other rides are a bit of a toss-up-- I'm on the larger side and I can ride pretty much every ride in the park (the restraints just really squeeze my thighs) but this may be different for other body types. Definitely give the Six Flags people a call beforehand, they're very accommodating and will be able to give you more information!
Majority of the rides that I was on was a snug fit for me. I am 5 3 and 170 lb. But calling Six Flags for more information would be a better idea.
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