i have a 78 elky w/305. with help i am going to learn how to rebuild the engine. unfortunatly my 2 sources for info on hp upgrades don't seem to agree on anything. for example one says to put a 3/4 racing cam in it, and the other one says that does not exist and i should put a cam w/.5" lift in it. another example is one says to put a 650 cfm carb on it and the other says do not go over 600 cfm. i am not sure how much hp it puts out now (i guess around 180) but i would like to keep the original engine and get 300 hp out of it. is this possible and do either of these people know what they are talking about? any info would appreciated.