I have changed the springs and weights in my HEI distributor using a Mr. Gasket set. After installing these and resetting the timing for 10 degrees initial at 700 rpm, I seem to have developed a slow/hard starting problem. For those familiar with the Mr. Gasket set, I am using the lightest (red) springs. The car runs much stronger but now the hard start is getting to me. Any ideas? What causes the hard start? The engine is a new 350/330 GM crate engine with 600 holley and headers.