I'm not a Ford guy but my brother and father both are. My dads been around a while and knows everything. He says the 300 six is bulletproof. Hence the 30 years of production.
------------------ 32 5W Coupe 64 Chevelle convert 53 Bel-Air 2dr sedan
32 5W Coupe 64 Chevelle convert 53 Bel-Air 2dr sedan