2056 still working out the bugs Options

[jmargush]

I am sorting out my recently built 2056 specs below:
2.0 Heads were done by Len Hoffman
CR 8.56:1
Full Raby valve train kit
Stock L-jet throttle body, air cleaner, and intake runners
stock 2.0 heat exchangers
pertronix ignition


It has a miss under hard acceleration.
All the vacuum lines and oil cap gaskets are new and I can't seem to find a leak any where.
So I decided to recheck the timing.
Pulled vac lines off the vacuum diaphragm and plugged, set idle to 800 rpm
timing was a little more advanced than it should be but not dramatically, but I did reset to factory setting.

Drove it and it is even worse than before.

Would the new engine combo warrant a different timing?

Fuel filter is new but my next step is to check fuel pressures and injectors.

Anything else I should be looking for?

[Java2570]

The AEM air fuel gauge I bought included the O2 sensor and the bung to weld onto the exhaust.
I started out using the no weld clamp (you have to drill a hole in the exhaust) and it works ok but
in retrospect, I'd get it welded if I did it again. That was on a Bursch muffler....if you're using heat
exchangers, it's best to install the bung on the muffler pipe after the collector merges. I'm not sure
there's a way to do it very well using a stock muffler....you could only use one side of the exhaust.
What's your setup, exhaust-wise?