How much compression can I get away with on my ET 967

I have my engine set up for 180psi at my altitude 7800' (yes 7800 ft) and wanted to ride my ski at 1000' this weekend.
I already planned on rejeting but just thinking about the compression too. Did the math and unless im wrong I would be in 225-230 neiborhood.
Can I run race gas and be ok or is that still pushing it?
This is on my hurricane im trying to sell so I DEFINATLY dont want to blow up my motor
thanks
 
Thanks everybody for the advice but it looks like I won't be bringing the ski to low elevation to ride this weekend. We weren't able to get schedules and timing to work out this time.
 
Bringing this thread back, my 967 is at 165, what psi are the pump gas domes supposed to be at? I'm guessing I should look at doing a top end here soon??
 
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