Adjustable or stock pushrods? If they are stock, are they in the correct position? Longest (green stripe) front exhaust, 2nd longest (purple) rear exhaust, shortest (blue) rear intake, next to shortest, front intake. Did you tighten the rocker arms down s-l-o-w-l-y to let the lifters bleed off?
If they are adjustable pushrods, look in the self help section (tab at top left of page) for several good articles on adjusting.
Just finished installing new lifters, but when I started her up, shes not running right, sounds like an air leak, but I've checked that,
an she spits from the carb, enoungh for gas to come out through the
air filter.. and suggestions?