I've got a 70 chevelle 402 in my 57 chevy. It sat afew years and when i fired it up again it keeps blowing the oil filter gasket out. The 1st time it did it right a way. The 2nd time after a couple minutes The last time I was able to set the lifters and run it about 15 mins. I reved it a little and got a backfire and it blew the gasket again. Any thoughts would be great