The 235 and 250 are completely different motors. Should be a 1 barrel carb on it. Performance parts are available. Headers intakes chrome covers etc. You mention it looks quite cluttered. You might have an integral head 250 from a newer truck. They had a 2 barrel. Integral means the head and intake are cast in 1 piece. No performance parts for this type motor though. Can you give a link to a pic. Easier to identify.