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Ok, got it. Cam is a Comp Cam Hydraulic Roller with;

Lift .541 intake .537 exhaust

Duration .230 intake .236 exhaust

Compression is 10.1



Proprietary??? That's a XR280HR

They may have cut it on a LSA tigher than the shelf 110* to make it "custom".

That thing shouldn't idle real choppy.

Look at the initial timing FIRST! Use a vacuum gauge or just turn the housing CCW and see if it picks up RPM. You'll likely need to work on the mechanical advance to clean it up. My guess, 18-22 initial timing and 14-18 in the mechanical advance.

It should idle easily at 800-850rpm, with very little chop to it. Shouldn't smell like a fuel truck out the tailpipes either.