so i blew my 360 at the beginning of june... i dropped a 390 from a 63 galaxie into my truck... the motor was barn fresh for about three years... the engine hasnt ran right since ive dropped it in... ive had to replace the head due to 3 burnt exhaust valves and one cracked intake... now my cam went flat... what would be stock specs for the oem cam shaft?? would they be along the lines of 0.280 intake and 0.295 exhaust?? i want to go to a bigger cam like an rv cam but not sure how big i can go before i have to start doing head, intake and exhaust work.... as long as i stay around the fuel mileage that i should be getting, ill be happy... the truck is a daily driver and will be getting new hydraulic lifters and push rods..... so i dont want to go over board with things