Read all the posts. I think you need to get the timing adv. all in by about NOW. This is a very similar combo to a 389 + .060 I built 25 yrs ago. Hc-01 cam and 8.4:1. Headers, tri-power, 13inch, 3.23s. 1 single light spring (gold) on the dist. Adv. came in at 1300 rpm. No ping. 12.7 AFR. 36 total. Moving the cam around with an engine hurt by manifolds wont do to much for the seat of your pants. Although a 108 icl is a good move. I have tested this stuff on a dyno, with a low VE engine, and the cam phasing doesnt yeild the kind of performance you would expect. You need to build cyl. presure quickly. Go to the manifold directly with the vac. adv. Dont mess with the possibly rich carb untill you do these mods. Rich is safe in these types of tests. BTW. the 64' GTO with the above engine went 12.87/105 @ 3280 with me in it. It would roast the tires from a 10mph roll (305/50/15 Euro T/As) 1800 convertor flash. 348 HP at 5700 and 395 lb/ft at 3400. Uncorrected on the old H-O Racing Go-Power Dyno. May want to shorten the curve up a bit with a custom stop bushing in the dist. My engine had 22 deg. initial and 36 total. Plus the 14 deg. in the vac adv. Thats 50 deg. at cruise. At idle my 389 had 36 deg. with manifold vac to the adv. canister. Made for a little bit of a nervous idle. But, I was looking for cylinder presure, NOW.
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