If I can raise my testosterone level fom 306 naturally will I still have the same side effects as the injections?

Yes, if possible... Raising serum testosterone with natural supplement is still an unreachable dream although many "naturally" herbal companies have constantly touted their such products online. What they have done serve them well for political correctness and commercialism with no scientifically documented effect. For one at 79, life should come first ahead of anything else. Detailing? Ask and talk with doc timely.
But how. At 79 the testosterone levels will be lower than some one in twenties , if there is a way to raise natural testosterone , with natural foods , then the illicit use by athletes ( for anabolic effect ) will not happen , you can not prosecute if some one has high natural levels . Speak to your doctor .