Hi, im helping my friend work on his '71 mustang. Everytime we start it the carb leaks gas. yesterday after running for around 3 minutes the whole back of the manifold was filled with gas. we replaced the diaphragm but that didnt help. the engine is a stock 302 with stock two barrell carb. hes got a 675 cfm holley carb but he doesnt want to put it on along with the torker manifold before he does the rest of the motor. Is there any way to stop the leak of would it be better to just change the carb.Thanks,Mike