i preformed the 200 to 350 swap and now the dam thing rolls forward in park and i cant find any other gear please help. this is kicking my *** anyone who can help thanks

 

u probly dont have your shifter hooked up right. that happen in my elcamino and i didnt have the shifter in the right place/mounting position

 

Its likely one of two things.
1. the shifter linkage is not adjusted properly to the ranges.

2. The selector shaft is loose on the inside of the transmission.

One way to check is to disconnect the shifter linkage from the transmission and then manually move the selector shaft through the ranges. You should feel the detents of each gear. If no detents or you are unable to engage the park paw mechanism in the park position, then then it is definatly loose inside.
The loose selector shaft can be accessed by dropping the pan. The selector shaft moves two things in the transmission.
The manual valve in the valve body (determins which gear you are in),
and the park rod.