nice yoke mark,id say we'll be able to have a rust competition at the next meet
As shane said above it is a cam engine in it a seriously handy engine to work on,took me 55mins in college to strip it down to a bare block and rebuild it with fresh big ends,rings,timing belt and associated parts (beat the college record by 17mins
) i would stick with whats in it you could always fit a few tasty bits you'll find loads the cam boys are always selling em,also that idle issue could be down to your idle speed control valve in the throttle body the waxstat in them gives a good bit of bother also would be worth checking your timing with a strobe just to be safe..it'll be handy