318 #302 head timing question

Recently I overhauled my 318 and in the process installed the 85-91 cast #302 heads, a comp cams H268 http://www.compcams.com/Company/CC/cam-specs/Details.aspx?csid=619&sb=0, an Edelbrock performer intake, and an Edelbrock 500 cfm carb part number 1404. I've calculated the compression ratio to be around 9.5:1(head gasket: thickness compressed .028in, bore 4.14in. Piston(flat top) to deck clearance .058in. Combustion chamber: heart shaped swirl port 59cc).

Has anyone had experience tuning an engine with these heads? Hot Rod magazine built one that cranked out over 400 hp and torque at the fly wheel. Their engine had closer to 10:1 compression, 2.02/1.60 valves, and very ported #302 heads. With this setup, they ended up making the most power with 30 degrees of total advance timing.

The instruction manual that came with my Mopar Performance electronic ignition kit says to set the maximum initial+mechanical for 35 degrees with a total of 50 degrees BTDC including vacuum advance for pre '89 ,motors. The heads I'm running were produced from 85-91.

I don't know whether the hot rod guys had additional advance from vacuum or just stayed with 30 degrees maximum.

If 30 degrees advanced is the maximum I should run, I don't want to risk detonation on my fresh motor by setting initial+mechanical+vacuum for 50 degrees.

What do you guys think? Should I leave vacuum advance out of the equation or go with the mopar performance instructions @ 50 degrees total?