Yes,I am staying with the .030 which is 3.905" bore. And the pistons are .030 in the hole. I was going to use .015" head gaskets that the factory used on these heads. About .045 quench with flat tops with valve notches. The heads have 58cc chambers. My original plan was to build it as a brackett truck and build it for top end/high RPM only but changed my mind.It will be a street (weekend/occasional driver). So now I probably should back off using this cam,(by the way the cam is a Summitt 'house' cam #1105).
I've never built a motor as small as a 283 for a street vehicle so I've no idea what the 'max' may be as far as duration figures???