Nice T/A you got there, PM, though it may be frowned upon, because you are not running a wheezing K series four banger. Out of interest is it a 305 or a 350? I had an IROC with a 350 TPI and that motor can be merely chipped to knock out nearly 300bhp. A high-flow intake, long-tube headers, removal of cats and some gasflowing of the intake would get you up around 330. If you've not driven a GM manual, check one out before you take that step - they're not great IMO - very truck-like, long throw etc. - even in the 'vette. Your 4 spd auto would need a shift-kit to toughen it up for the heightened hp you're going to put through it, but it will cope (mine did) with simple mods and the slusher will give you better et's than the manual anyway. Either way, nice car - you should be proud of it.