360 timing

to 4spd....Probably no such relationship,but maybe.
-The 51* power timing will have to be changed, to somewhere in the low to mid 30*s. And the vacuum advance can add anywhere from 0* to 20*to what ever the mechanical advance is doing, and depending on the cans ability and the vacuum available at the sparkport.
-In this case,as it now stands, it COULD be up to 71* with a working 20*can, Which is why I said "dont drive it this way".
-BTW,Ted, still waiting for the compression test results.And I will tell you why thats so important.I have tuned sbm engines with aluminum heads and over 205psi compression to run on 93octane E-10 fuel, here, at 900 ft elevation.With iron heads its better to be down at 185 or so. If your engine is going to make 240psi, you will never be able to run it WOT on 93 without it self-destructing, and trying to tune it will be very difficult indeed.Now, I heard you say that the previous owner cruised it around just fine.Well thats quite possible, to just cruise it,I mean.Because at small throttle settings, the Effective Compression is low, and you can get away with it.But as throttle openings and rpm and load increase, the dreaded rattle will show up.Id really like to get that squared away before we get too deep into this.