Engine swap question

[NurseBen]

Hello, I have a '69 CST with a 350 that I would like to replace. I have access to a 1996 K2500 Suburban auto transmission with 150,000 miles for free. I have been looking at a 383 for a replacement but with this costing nothing would it be an option? Would it just end up being a nightmare of wires? Would it even fit? I know nothing about these engines but doing a quick google search it looks like a 454 TBI. Is this engine just a pig and would I better off just passing? Thank you for your replies, Ben.