My Ford buddy in high school had his dads old Cyclone GT 390. Motor was on its last legs so we pulled it and put a 302, then a Cleveland with 2bbl heads and a 4bbl intake. Erson Hi-flow 2 cam and it ran like a scalded dog. He had that car for years and finally found a set of 4v heads. Stroked the 351 to 392 and installed EFI and it was even faster. Sold the motor last year in a 67 Mustang after 28 years. I enjoy these posts.