I've just built an engine from about 3 that were lying around , we've ended up with rs turbo block , head . 1.6i crank , pistons , and camshaft . all new gaskets ,bearings etc etc (as new) . we've put 200 miles on it now and it has a slight misfire under load cut a long story short the camshaft wasn't the best . I've now compared all the cams I've got and not one of them seems to be the same ?? I'm guessing rs turbo head so i need an rs turbo cam ? it also on a carb ?