Hello, this may sound kinda basic but i want to know how to find the optimal timing for my gto that has been modified. how do i find and set the best total timing for it. It is a 455. it has edelbrock alumn heads, diffrent cam, i have the card for it if that makes a diff, also has HEI, also has 355 diff. its a four speed car. i have had the car for a year and havent messed with the timing but would like to find a good baseline to start with. anyone have a similar setup? thanks  

Need to know cam specs and compression ratio.  

basic timing should be between 10-12 deg. @ idle totsl should be no more than 35-36 running cool