I recently picked up this machine and it runs nice, not smoking, no noises, etc. The issue is it leaks oil from side cam plug cover and one of the 5"+ cam cover bolts is broke at the base. I believe I need to remove the head and drill out and extract bolt and then reassemble with new gaskets. I’m getting quotes from $250 to $700 dollars to fix. I’m fairly wrench capable and may try tackling myself. Does anyone know if this can be done without removing the entire engine? Anything else to be aware of? Please help. Thanks!