Dude, start WRENCHING. A rocker cover gasket on these is a no brainer job. The gaskets are less than $15 on ebay and are only held down by 2 bolts. Add some RTV silicone to make it leak free. You will need to take the intake cross over off the manifold to get to it but once again, an easy job for a noob to tackle. And there's $250ish in your pocket. You need to get everything squeaky clean so my tip - non caustic oven cleaner. Makes short work of engine grime, cheap to buy, only need a can to do an engine, safe enough to get on everything without damaging paint/ plastic/rubber seals/your hands etc (if I had known this tip waaay back, I could've saved myself a lot of time, mess and some money too)

https://www.ebay.com/itm/Victor-VS40...VQ9H31&vxp=mtr

https://www.lowes.com/pd/Easy-Off-24...ner/1000327439 (this or a similar product for for your engine bay)