Be careful with local builders if they don’t have experience with LS based engines. There really are benefits to using someone like TSP that builds LS stuff every day. They will know exactly what you need to make everything play nice together in your car.I'm actually considering that. I may reach out to a local engine builder this week and get an estimate on what the machine work and bottom end labor cost would be, and then I guess I'll go from there.You'd have to get the LS2 resleeved, and you might as well build a 427 at that point.
The great thing about the LS3 is the heads, the bore size just helps with flow around the larger intake valve.
I suppose I'll make the decision on what is best once I get a better handle on the cost of everything.