Maximum advance curve on my 360

Thank you all for your replies.
My car is a VC val with 3.23 gears, 904 trans 2000 stall and runs a MSD 6AL ignition.
I had this problem with my earlier 318 engine in the exact same car. Since the 318 engine had stock 360 heads installed, I rebuilt them again and reused the heads on the 360 block. So in fact I am using the same heads. The dizzy is the same off the 318 which I had recurved for this problem. Before I was running at 14 degrees with 35 total. But then I was using AV gas (30%) to shut it up. I recurved the dizzy to have 10 degrees less in the curve so I can get rid of the AV gas (it is illegal now on the street and expensive). So I ran 12 initial and 15 centrifugal total of 27 degrees. All O.K. But now with the new 360 block using the same heads and dizzy I am getting the same characteristic as before. This new engine likes this curve. I cannot give it more than about 27 to 28 degrees total advance. I am tending to lean towards the fact that I am not bleeding enough compression with this cam profile. It should have been around about the 9.5:1 mark. The 318 was in the same boat. Also I think these heads may produce hot spots in the chambers. Apart from shaving the heads to 65cc's They have not been touched anywere else. Or the combination of small valves and close exhausts (block huggers all into a single 21/2" outlet out the back) can contribute to high cylinder pressure also. Don't get me wrong the 318 with that dizzy curve went hard and this 360 feels much stonger. The 318 was dyno tested to have 192Hp at the rear wheels at 5000RPM. 380FTLB at 3000RPM. This was with a 218/224 .447 lift cam profile and a 600 vac sec Holley. This 360 although it has stock heads was dyno tested to have 252Hp at 5200RPM (238Hp with the 600 Holley recalibrated to 12.6:1 AFR @ WOT) with a 770 vac sec Holley set to 12.5:1 AFR @ WOT. Tractive effort was only measured instead of torque and it was in excess of 1250 pounds ( I don't know what that would be in ftlb's) at 3300RPM all at the rear wheels. 1/4 mile times best on the 318 was 14.2 seconds @ 95MPH at Eastern Creek. The 360 has not run yet. I am sorry that I wrote so much but all my mates don't want to listen to what I have to say because they drive Fords. I hope I have put enough info for you all to read.
Kind Regards
Billy D>>>