The first question to ask is what do you want from your engine? The cost of parts and pieces for a 283 or pre 68- 327 is about 3 times that of a newer 350. If it is authenticity then redo the 283, if it is to get a reliable plus better HP go to the 350 block after 68. That 1990 engine probably has Vortec heads which are better and flow more air than the old Hump heads. You can do just about anything with the technology nowadays. Have fun with your decision.
