In need of some 273 head education

I have the 273 motor also. It was rebuilt in july and has not got over 2000 miles on it yet. It is a strong running little motor and has a few details to work out yet. But it will crank and go and sometimes is hard to start after warm up but it will crank in less than 5 to 10 secs of turning it over. I am working on that however. I would like to have a more radical idle but it seems I can't achieve that because of small bore size and low compression. I did a compression test on it tonight and found out that it really is a small motor. The readings are :

1= 115 2=125
3= 110 4=110
5= N/A 6=115
7= N/A 8=105

Now I couldn't read the 5 and 7 cylinder because of the header being in the way because I have the push and hold type compression tester. I need the one with hose to read them. I don't know why the readings are so low being a new motor. Cylinder number 2 read 125 ??? Are the readings about right for a 273. The guy that built the motor said that it is a 9.8 to 10 compression motor. So I really don't know.