Burping is usually not a real big issue in an SBF. Some folks jack the front end, park on inclines, etc.. though.
What can be an issue I see it close to 50% of the time on new sbf builds is a CCW waterpump and timing cover being driven CW (clockwise) and also a CW pump being driven CCW. The pump impeller does not pump hardly at all as only the tips grab water.
If you can post the part numbers for the timing cover and water pump you used and a pic of your pulley belt orientation that can be answered pretty quickly.
Do you know for sure you have air trapped? Before you get too far in this, you may want to pressure test the cap and the system, first. T-stats mysteriously go bad during rebuilds too.
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