That sounds about right.
I put the 194 at 400 lbs with starter, carb, fan, etc but no flywheel (I weighed it), 350 Chev is about 530 lb, that is about the same as the Ford 351w.
Based on the crank I guess the 250 at 10lbs over the 194, and the 292 about 50 lb over that based on the extra 1.5" of block height.