IMO intake manifold isnt worth it....

find a spare long block - some guys all but throw these away, i sold one for 250 bucks and wish i'd kept it for my rebuild....

anyway get the long block, get some new pistons (high c/r if you want all motor) and some nice cams, at least Crower 403's 404's if you want to do serious tuning.... and get a shorter ratio tranny.