ultimate street 318

I was asking cause I have a couple 318's. And, the one that's in the car is giving me grief. I have a clatter at mid rpm, the oil light fickers alot, and I am scared to drive it. Once in a while there are even more sinister sound coming from in there, so the new cam and etc that I bought are staying in their boxes, I'm waiting now to save enough for machine work, I'm gonna build the 1970 block I have. I have some 625 heads but I aint sure if they can be ported enough to be worth the cost, but I think with some 1.88/1.60 valves and some pocket work they might be ok. I don't know if they can be gasket matched or not, I don't want to cut into the water jacket, I'm really gonna have to do it slow cause I am so limited on funds now. I had some grand ideas but since the one I was counting on to get me to work has let me down I'm in a pressure situation. I have to get it going asap on basically pennies.