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I think the Rhoads lifter is going to hurt you. If you're going to try it do it on intake only. The exhaust closing ramp on all cams is very gentle. If you're running a knock sensor its going to hear the noise and pull out some advance. High intake vacume=higher pumping losses. Open waste gate at low throttle to reduce exhaust back pressure. I'd try retarding the cam 5deg. keeping exhaust valve closed longer extracting more usefull work from still relativly high cylinder pressure. Later intake closing lowers vacume. Pull an 8"hg depression into crankcase via intake vacume. Don't pull any more as gaskets and seals don't like it. Last heat the fuel to 180deg. F This will extend your lean burn limit and slighlty higher flame speed. It may tend to vapor lock on hot restarts. Turn off fuel pump while cranking cures that.
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