New cam and heads for original 273?

Thanks guys! That info is really helpful. I have the engine down to mostly the block right now. When i pulled the pan there were a couple small metal shards that i assume came from the timing gears. I say this because the cam and bearings looked unharmed. I'm taking the heads to get looked at tomorrow but i want something with a little more 'umff' so i might inquire about the 302 heads. Now what about the rockers? Should i continue to use the stock ones?