Jack91Z28

Im sure someone has already asked this question somewhere on here i tried the search multiple times and couldnt turn up anything. Basically I have a injector down in my 04' Chevy 1500. I found a full set of injectors cheap but during my search i found a thread where someone was saying that the Flex Fuel injectors are supposed to be 34lb's? I believe the stock ones are something like 26. So here is the question, Can i swap in the larger Flex Fuel injectors without any tuning modifications? I have a bigger cam going in and a few bolt on's currently and would like to tune it eventually. So basically will my stock ECU support the larger flex fuel injectors until i finish the other mods and get a tune? BTW this is my daily driver. Thanks in advance and sorry if this has been asked a bunch of times before.