ok so i bought type r cams for my b16 ek. wen putting them in i think i ****ed up big time!

i read online that the specs were 20ft lbs for the 12 mm bolts and 8foot lbs for the 10 mm bolts. well doing so 5 bolts broke so like an idiot i tried starting it but it made a wierd noise so i turned key quick. the noise may have been my
exhaust due to having open headers but im not sure. could there be any major damage?? what should i try to do?