My grandfather has a 67' Gmc 4X4 that has a 74' Blazer 350 in it that has been sittin for 16 years. It ran 16 years ago when parked, the only reason it was never run again is that the Bell Housing needed changed cause the housing used on the 305 V6 was diffrent than the 350 one so he got the one that would fit the 350 but never got time to put it on and it was eventully forgoton but, I hope to find time to fix it sometime this or next year.