That is the exact set up I have in my 79 TA. With the exception of the .028 cut that zero decked your pistons. I do not have any overheating at all. I do have detonation with 93 octane. I have to bump it up to around 100 to get the best performance/power. The audible detonation disapears at around 94 to 96 octane. There can still be combustion problems that are inaudible. A sure sign would be a slight bog when quickly accelerating. If you find that you have better power with a little higher octane then it's better to be safe and use the octane level at which you get the best performance. You can get piston, rod and bearing damage from inaudible detonations.