I know I am late to the party, but the issue with 2 barrel (500 cfm) circle track engines is above 4200 RPM they start pulling a manifold vacuum. On a 350 chevy, at, 6200 they are pulling 4in of vacuum, I am sure a 360 would be pulling more. So what this means is the timing used to come out of the curve for max power needs to be increased going down the straightaway, due to less cylinder filling. I have done a lot of development work on the dyno with 2 barrel 350 chevys. What we found is if we had max timing for HP above 5800 we lost peak torque. The solution (within the rules) was to modify the vacuum advance to add 4 degrees of timing once the manifold started to make a vacuum. With all that being said and if you are allowed to pick any distributor, I would pick a progression ignition, it's an all-in-one unit, that allows precise control of your ignition based on rpm and MAP. Also, all tuning can be done from your phone.
Progression Ignition