My truck came with a 305, but I've put in a 350 since. Do i need to change the RAM and limp mode chip on the ECU or not. I just now thought of this today... I already have a custom chip for the 305 from a year or two ago.

 

I would check with they guys at LS1.com, but I am pretty sure all you need is a custom PROM for a 350 swap and you should be fine.

If you need someone to do this go to TBIchips.com.