I have a 69 250 ohc and iam having problems with it wanting to die on me when i come to a stop, thought the carb. needed adjusting so after adjusting myself did not fix the problem I took it to the shop they said it was not the carb. it was fine they did a compression test and said the #5 cylinder only registered 30 with all remaining cylinders reg.around 150 they said it was probably the cylinder head is cracked. my question is if it is cracked would this cause it to want to stall when stoping?