overheating still

[STRICK]

Hey whats up everyone I have a 1960 vette and have overheating problems. It's a new rebuilt 283 small block with a new water pump new theromostat new alumnium cool rad. the crossflow one $575.00 and hoses and still overheating running for maybe 5min drive time and heating up to 190 and raising fast to 220 and maxing the gauge out. Oh by the way the thermostat is rated at 160. I have taken the thermostat out and was able to drive it longer a couple more times around the blocks and on a small straight a way before the temp started to rise above 210. I think it started to overheat because the water was going through the rad. so fast no time to cool. I have also try changing out the theromstat with a new one and does the same thing as the old one did. No hose are clasping in high speed. the car will over heat just idling after a while. The fan is pretty close to the rad. and if i put a piece a paper in front of the rad. and rev-it up the paper will suck to the rad. oh bye the way when I drive it a round the block I'm not just putting around I'm getting on it just me in the nieghbor. Every time i put the theromostat in it overheats faster. sometimes when the theromostat is in the car get hot but not the rad. like its not circulating. please help lost what to do next.