SBC 383 vs LS 427

Hello, this might be a dumb post and I know I’m overthinking it, but I’d like to hear opinions from people in the field working with engines every day… I’ve got an 86 square body with a 350 currently in it, I also have a short block aluminum LC9 5.3. The goal for the truck is a rowdy pro touring street truck with a high compression e85 engine with around 600 whp, I do plan on throwing a 200 shot on it as well. End goal is 8xx with nitrous. I was planning on sleeving the 5.3 out to 4.125” and building a 427 out of it, but now I’m wondering if I can achieve the same goals with the small block if I stroked it out to a 383 for cheaper considering I already have all the accessories and drive line for the small block. Anyone who has done similar builds, which route you go?