Make sure your dynamic compression is no more than 8.5 to 1. Adv duration of your cam divided by 2 plus your lob sep then subtract 180. Ex... ADV 290/2 = 145 + 110(lob sep) = 255 - 180 = approx 75 degrees ADBC. This is where your intake valve will be closing in reference to rotation. With longer duration camshafts your will get compression bleedoff thru the intakes valves because they stay open longer respectively. You can run 11.5 : 1 or more static compression on pump gas if you cam events bleed down to 8.5 dynamic/effective compression. Its why some hp calculators call for dynamic instead of static compression for predictions.