318 cam

My 2 cents! If your using stock components use a stockish cam. There are alot cams out there for cheap like the RV cams and such that are very close to stock. One of the biggest performance killers is over cammed. Best case is to find an original 360 cam they are just a touch bigger but you can still use factory springs and such. I would start by measuring your factory valve to guide clearnce and spring bind and limit your cam based off that if you want to do it on the cheap. When talking "budget" keep it stock and your wallet will be happy. I did a "budget" build and went with a bigger cam and ended up having to cut the guides change springs, seals etc it costed alot!