you could get a set of stock L67 heads for 150 shipped, or find a local junkyard and should be able to get both heads for 100. then you would need the lower intake manifold, and that would be about 50. you would need to swap out your map sensor for an L67, probably find one of those for 50, then you would need a set of L67 injectors, and those would be about 40 or 50. then if you wanted to really make your top swap shine, you could add an XP cam, a new one is about 325, a set of 130 lb valve springs for 100, valve seals are about 20, valve cover gaskets are about 20, and modified valve spring retainers are about 20, and a new set of valve locks are about 20. you would need a double roller timing chain which is 130 for a new one, a machined oil pump cover for 40 or something. and that should just leave you needing all the gaskets necessary when changing all the parts.
you would also need headers to maximize the airflow. you can get a new set of speed daddy headers for 250.
at some point you will need some transmission work.
someone correct me if im wrong.
edit for additional info: a top swap at that mileage is fine.
