A 318 was alot of fun back in the day because they were dime a dozen, drop one in try and break it and if it does break get another...alot of fun. They weren't something you would dump money into trying to prove they are just as good as a 340....but you could play around most I ever did was a cam headers and 600 Holley 4160 model. Not a ton of money invested stock heads etc.