Call Summit and get the weight kit. It will have to be welded on, but it will do the job on your stock converter. You might want to consider buying a new/re-manned converter. They are cheap and can give you better performace and peace of mind. I'd also use a steel shim head gasket instead of the fat fel-pro composite style. That engine might have 8:1. Make sure you do the usual stuff, check the rod bearings and replace the t-chain while you have it out.