Jakeydee

Have recently picked up a v2 type ra of what originally thought had a cracked head so plan was to rebuild once the uni semester has finished. Typical signs are oil in water, water bubbling, white smoke and overheating etc according to previous owner... have driven it for a good half an hour and now confused on whether it actually is a cracked head, the motor didn't overheat, it ran normal temperatures, the smokey exhaust cleared after it warmed up to running temperatures BUT the water DID bubble a little. It also splutters under load and wont boost similar to having a broken afm. Have been suggested it may be an air lock somewhere in the motor and have been suggested to jack the car up onto a 40 degree angle and run it for 5-10 minutes. Any help on the situation is welcome and past experiences! Cheers in advance.