your opinion... 400 hp with these heads is not out of the possibility although starting from scratch it would more difficult then a 360 head. but used in the right spot these heads are great. we as mopar guys are in great shape with our factory heads. go build a chevy and you will understand. read this thread
http://www.forabodiesonly.com/mopar/showthread.php?t=167865 if you have the skill to do some of your own work you can make some really good power with 318. good suggestion have been stated already. but heads are the key to power and if the pistons are there like suggested and a better cam like suggested do some work on the head like the head porting thread you will make some good power.cheap power
