You'll have to get it apart and check piston to wall clearance. It the cylinders are excessively worn, it will have to be bored oversize. When you have the block done, your machinist can check that for you....

Think I'd stick with the stock rockers, and just a mild cam. Comp Cams has a program called "Cam Quest" that you can download for free on their site, or Techinspector is a much better cam man than I.... I usually call the company (I use Comp Cams) and talk with one of the techs rather then just go with what so and so said worked good in his second cousins car that was kinda the same engine!!!!!

If the intake is a dual plane, it should be well suited for street use...