Sbc 350 .040, cast iron block, rotating assembly from speed o motive= 3.562 forged crank, eagle 6 inch h beam rods, srp flyweight pistons for a two barrel ?, 8 inch performance products balancer, McLeod 30 lb 168 tooth flywheel. Clutch, pressure plate all from McLeod. Solid flat tappet engle grind 256/264 at 050. Dart pro 1 heads victor jr and mighty demon 750. Msd pro billet with black advance bushing=18, and a base timing of 18. Lash set at .020, .022 cold. The engine shakes bad at idle, but stays steady when revs increased, I am thinking I have excessive fly wheel runout? Have no clue. Using stock front mounts, Lakewood bellhousing with stock rear mounts ant the tranny has an aftermarket mount no of which is poly, it's all stock but newer rubber units. Any thought or info would be appreciated. Plugs show rich condition, not fouled, using moon spark plug wires. I suspect the flywheel because the starter engages once Ina while, sometimes grinds, sometimes goes dong dong like it locks up on something, then with a whisper fires the car right up. I'm all over I know, just trying to list the parts and symptoms associated with them