Bork;
I had more thoughts about what could be causing RPM limiting...both Ignition related...
What kind of noise does it make when it hits that RPM limit? Does it sound like a Rev-Limiter, with intentional cylinder drop-outs, or does it still run true and smooth, but just doesn't want to go higher (which is what I expect a flow-restriction would sound like). A short video would be helpful...
Has the Distributor been apart? Getting the clocking of bottom driving shaft, and upper Lobe-shaft wrong on reassembly, can cause Rotor to align fine with plugwire stations at idle, but not at higher RPMs as Cent Advance moves Rotor earlier and earlier misfires would result...this would effectively result in a mechanical rev-limiting (sounding like a misfire at that time).
Good Hunting!
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