Echlin #VC-1810 advance can or equilivant

Kendog 170 said

Actually 10:8 to one. My 340 is 10to1 . I have a MSD 8680 Timing controller with Dial in ashtray with an MSD 6A Box. It failed 2 months in. I wired my stock back in. Msd fixed it so I am going to rewire harness for both so if it fails I wont be stranded. I will mess around with the can but also increase or retard a little on the hyway with the dial to see what she likes. Thanks for the info .

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Go to the "How To" section. In the post I did about adjusting vacuum advance there is a page from the Direct Connection instruction that will get you in the ballpark.
Then to get an idea about the shape for a high performance big block mechanical advance, do a search for where I've posted a graph of the timing specs for a '67 440 Hi-po package.
if you cant find it, send me a PM and I'll dig it up.