I am swapping to a 350 with a LT4 cam. I am aware the computer's fuel map cannot support the added displacement.

I went to a performance shop, and they told me I need to get a 350 TBI truck computer and harness. I think he is FOS.

What do you guys suggest?

 

A 350 truck computer isn't going to provide more fuel than say a 305 car computer. It's all relative to LOTS of other variables, fuel pressure, injector size, and many other things. Don't let somebody tell you a 7747 is better than the 8746, that's only if you're planning on adding 1000lb to your car, ditching the IAT sensor, AND installing a flat tap L05 350

 

I ordered a 9C1 caprice computer and throttle body w/injectors.