well Ron, from Omaha, your 68 318 better be of the 9.5 Scr persuasion, or don't be surprised if it turns into a pos.
Wikipedia says that you are at about 1000ft elevation, so before you get carried away, you better run a compression test.
To run that lumpy cam and actually be able to drive it, you may have the added expense of a hi-stall TC and some big rear gears, else it will be real embarrassing when a kid on a bicycle blows your doors off.